diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62da10f..3e8e66f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,7 @@ set(SOURCES
   src/core.c
   src/display_engine.c
   src/mutation_engine.c
-  src/mutation_data.c
+  src/data.c
   src/epidemic_engine.c
   # ...
 )
diff --git a/Plague.g1a b/Plague.g1a
index 1e81fb2..9f45fa9 100644
Binary files a/Plague.g1a and b/Plague.g1a differ
diff --git a/src/core.c b/src/core.c
index 9c397d6..3309fe4 100644
--- a/src/core.c
+++ b/src/core.c
@@ -45,8 +45,8 @@ void next_frame(struct game *current_game)
     current_game->time += ENGINE_TICK;
     if (current_game->time > LIMIT_TICK)
     {
-        if (current_game->dna <= 100) current_game->dna += 1;
         current_game->time = 0;
+        if (current_game->dna <= 100) current_game->dna += 1;
 
         current_game->research += current_game->priority;
         // if (current_game->research > current_game->limit) ; game over
diff --git a/src/core.h b/src/core.h
index cd3f2dc..8296bb9 100644
--- a/src/core.h
+++ b/src/core.h
@@ -34,6 +34,9 @@ struct game
 
     // Planes
     struct plane *planes[NB_PLANES + 1];
+
+    // Grid for epidemologic model
+    int grid[64][128];
 };
 
 // plane : information about planes
diff --git a/src/data.c b/src/data.c
index bcdd428..9c0b49e 100644
--- a/src/data.c
+++ b/src/data.c
@@ -52,70 +52,70 @@ const struct mutation transmissions_data[13] =
 const struct mutation default_value = {0, 0, 0, 0, 0, "NONE"};
 
 
-const int world[][] = 
+const int world[64][128] = 
 {
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-    {00000000000000000000000000001111111111111111111111110010000000000000000000000000000000000000000000000000000000000000000000000000},
-    {00000000000000000000000000101111111111111111111111111110000000000000000000001101111000000000011000000000000000000000000000000000},
-    {00000000000000000000000010111111111011111111111111111100000000001111110000000000000000000000111100000000000000000000000000000000},
-    {00000000000000000001101101011111101111111111111111111000000000001111000000000000000000000000000111000000000000000000000000000000},
-    {00000000000000000111001000101111000111111111111111111100000000000100000000000000000000000000000011000000000000000000000000000000},
-    {00000000000000001111110110010000000110111111111111111000000000000000000000000000011100000000111111111000000001110000000000000000},
-    {00000000000000000001100000111110000000001111111111111000000000000000000000000000100000000001111111110000000000000000000000000000},
-    {00000000000000011110011010101111100000001111111111110000000000000000000000000001000001001111111111111111110000110000000000000000},
-    {00000000000000011111111011101111110000001111111111110000000000000000000000000011000011111111111111111111110111111100000000001000},
-    {00111110000000000011111101101111111100001111111111110000000000000001111000000000000011111111111111111111111111111111100011100000},
-    {11111111111111111111110001111110011100000111111111000000000000000111111111000011111111111111111111111111111111111111111111111000},
-    {01111111111111111111111111111110001111000111111100000000000000001111111111111111111111111111111111111111111111111111111111111111},
-    {11111111111111111111111111111100111100000111110000011110000000001111011110111111111111111111111111111111111111111111111111111110},
-    {00111111111111111111111111110110001110000011110000000100000000011110111111111111111111111111111111111111111111111111111111110000},
-    {01111111111111111111111111100001110010000011100000000000000000111101111111111111111111111111111111111111111111111111111111000000},
-    {11111110111111111111111111000000111000000000100000000000000000111110101111111111111111111111111111111111111111111110011010000000},
-    {00111000000111111111111111100000111111000000000000000000011000101111111111111111111111111111111111111111111111000000110000000000},
-    {00010000000111111111111111111000111111000000000000000000001000011101111111111111111111111111111111111111111110000001110000000000},
-    {01000000000001111111111111111111111111110000000000000000111100011111111111111111111111111111111111111111111111000000100000000000},
-    {00000000000000111111111111111110111111110000000000000000111111111111111111111111111111111111111111111111111111100000000000000000},
-    {00000000000000111111111111111111111111110000000000000000001011111111111111111111111111111111111111111111111111010000000000000000},
-    {00000000000000011111111111111111111110011000000000000000001111111111111111111111111111111111111111111111111111000000000000000000},
-    {00000000000000001111111111111111111111100000000000000000000011111111111111111011111111111111111111111111111110000000000000000000},
-    {00000000000000011111111111111111111010000000000000000000011111101111110000111011111111111111111111111111111100110000000000000000},
-    {00000000000000001111111111111111111000000000000000000000011110011101111111111001111111111111111111111111110000100000000000000000},
-    {00000000000000001111111111111111110000000000000000000000011100000101111111111001111111111111111111111100110000100000000000000000},
-    {00000000000000001111111111111111100000000000000000000000001011110000001101111111111111111111111111111110010011000000000000000000},
-    {00000000000000000111111111111111100000000000000000000000011111110000000011111111111111111111111111111110001110000000000000000000},
-    {00000000000000000011111111111110000000000000000000000000011111111101100011111111111111111111111111111111001000000000000000000000},
-    {00000000000000000001111111010010000000000000000000000000111111111111111111111011111111111111111111111110000000000000000000000000},
-    {00000000000000000001111110000010100000000000000000000001111111111111111101111100111111111111111111111110000000000000000000000000},
-    {00000000000000000000111110000000000000000000000000000011111111111111111111111111100011111111111111111101000000000000000000000000},
-    {00000000000000000000001110001001100000000000000000000011111111111111111110111111100011111110011111110000000000000000000000000000},
-    {00000000000000000000000111011000101110000000000000000011111111111111111111111111000000111100011111000000000000000000000000000000},
-    {00000000000000000000000011111100000000000000000000000011111111111111111111011110000000111000000111100001000000000000000000000000},
-    {00000000000000000000000000011100000000000000000000000011111111111111111111111000000000111000000111100001000000000000000000000000},
-    {00000000000000000000000000000100011101000000000000000011111111111111111111111100000000010000000001000011100000000000000000000000},
-    {00000000000000000000000000000011111111100000000000000001111111111111111111111100000000001000000100000100100000000000000000000000},
-    {00000000000000000000000000000000111111111100000000000000011100111111111111111000000000000000001010000110000000000000000000000000},
-    {00000000000000000000000000000000111111111100000000000000000000011111111111111000000000000000000110001100010000000000000000000000},
-    {00000000000000000000000000000001111111111111000000000000000000011111111111100000000000000000000010011111000100000000000000000000},
-    {00000000000000000000000000000001111111111111110000000000000000001111111111000000000000000000000011000011001111110010000000000000},
-    {00000000000000000000000000000001111111111111111100000000000000001111111111000000000000000000000000110000000001111101000000000000},
-    {00000000000000000000000000000000111111111111111100000000000000001111111111000000000000000000000000000111100000101000010000000000},
-    {00000000000000000000000000000000111111111111111000000000000000000111111111000000000000000000000000000000001110000000000000000000},
-    {00000000000000000000000000000000011111111111110000000000000000001111111111000100000000000000000000000000111100010000000000000000},
-    {00000000000000000000000000000000001111111111110000000000000000001111111111011100000000000000000000000000111111110000000000010000},
-    {00000000000000000000000000000000000111111111110000000000000000001111111110001000000000000000000000000001111111111000000000000000},
-    {00000000000000000000000000000000000111111111100000000000000000000111111110011000000000000000000000001111111111111100000000000000},
-    {00000000000000000000000000000000000111111110000000000000000000000111111100011000000000000000000000001111111111111110000000000000},
-    {00000000000000000000000000000000000111111110000000000000000000000111111100000000000000000000000000000111111111111110000000000000},
-    {00000000000000000000000000000000001111111110000000000000000000000011111000000000000000000000000000000111111111111110000000000000},
-    {00000000000000000000000000000000001111111100000000000000000000000011110000000000000000000000000000000111100011111110000000000000},
-    {00000000000000000000000000000000001111111000000000000000000000000001000000000000000000000000000000000100000001111100000001000000},
-    {00000000000000000000000000000000001111110000000000000000000000000000000000000000000000000000000000000000000000111100000000110000},
-    {00000000000000000000000000000000001111000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000},
-    {00000000000000000000000000000000001110000000000000000000000000000000000000000000000000000000000000000000000000001000000001000000},
-    {00000000000000000000000000000000001110000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000},
-    {00000000000000000000000000000000011100000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000},
-    {00000000000000000000000000000000011110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000},
-    {00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000},
-    {00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000},
-    {00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000},
-};
\ No newline at end of file
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+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+};
diff --git a/src/epidemic_engine.h b/src/epidemic_engine.h
index 2df329b..cb99377 100644
--- a/src/epidemic_engine.h
+++ b/src/epidemic_engine.h
@@ -1,6 +1,9 @@
 #ifndef _EPIDEMIC_ENGINE_H
 #define _EPIDEMIC_ENGINE_H
 
+// humans per case of the epidemic grid
+#define HUMAN_PER_CASE 1000000
+
 // count : return an int *counter[4] of the form {healthy, infected, healed, dead}
 int * count(const int epidemic_grid[64][128], int counter[4]);
 
diff --git a/src/main.c b/src/main.c
index 3285080..7f4669b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -57,7 +57,9 @@ int main(void)
 
         .time = 0,
 
-        .planes = {&plane_1, &plane_2, &plane_3, &plane_4, &plane_5, NULL}
+        .planes = {&plane_1, &plane_2, &plane_3, &plane_4, &plane_5, NULL},
+
+        .grid = {},
     };
 
     main_loop(&current_game);