diff --git a/src/lib/world.rs b/src/lib/world.rs
index 9b81587..d603d4b 100644
--- a/src/lib/world.rs
+++ b/src/lib/world.rs
@@ -1,5 +1,6 @@
-use crate::Screen;
+use crate::{Screen, BoardCommand};
 use crate::Point;
+use crate::{Entities, Queen};
 use std::collections::HashSet;
 
 #[derive(Clone)]
@@ -29,3 +30,49 @@ impl World {
             .collect()
     }
 }
+
+pub fn render(e: &Entities, w: &World, b: &Screen) {
+
+    for c in w.cleared.iter() {
+        b.render(c, "x");
+    }
+
+    for a in e.data.values() {
+        a.render(b);
+    }
+}
+
+pub fn simulate(e: &mut Entities, w: &mut World, b: &mut Screen) {
+    let cmds: Vec<BoardCommand> = e
+        .data
+        .values_mut()
+        .map(|a| a.step(b, &w))
+        .collect();
+
+    for cmd in cmds {
+        match cmd {
+            BoardCommand::Move(old_pos, pos) => {
+                // still makes no difference
+                // occupied needs to be updated as soon as the move is made...
+                w.occupied.remove(&old_pos);
+                w.occupied.insert(pos);
+            }
+            BoardCommand::Dig(pos) => {
+                w.clear(pos);
+            }
+            BoardCommand::LayEgg(pos, id) => {
+                e.add_egg(pos.0, pos.1, id);
+            }
+            BoardCommand::Hatch(egg_id, queen_id) => {
+                let egg = e.data.remove(&egg_id);
+                let pos = egg.unwrap().get_position();
+
+                let q = e.data.get_mut(&queen_id).unwrap();
+                let queen: &mut Queen = q.downcast_mut::<Queen>().unwrap();
+                queen.egg_count -= 1;
+                e.add_ant(pos.0, pos.1);
+            }
+            BoardCommand::Noop => {}
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 747faa8..29c565c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,55 +16,9 @@ mod lib {
 
 use lib::point::Point;
 use lib::screen::{init_screen, BoardCommand, Screen};
-use lib::world::World;
+use lib::world::{World, simulate, render};
 use lib::entity::{Queen, Entities};
 
-fn render(e: &Entities, w: &World, b: &Screen) {
-    for c in w.cleared.iter() {
-        b.render(c, "x");
-    }
-
-    for a in e.data.values() {
-        a.render(b);
-    }
-}
-
-fn simulate(e: &mut Entities, w: &mut World, b: &mut Screen) {
-    let cmds: Vec<BoardCommand> = e
-        .data
-        .values_mut()
-        .map(|a| a.step(b, &w))
-        .collect();
-
-    for cmd in cmds {
-        match cmd {
-            BoardCommand::Move(old_pos, pos) => {
-                // still makes no difference
-                // occupied needs to be updated as soon as the move is made...
-                w.occupied.remove(&old_pos);
-                w.occupied.insert(pos);
-            }
-            BoardCommand::Dig(pos) => {
-                w.clear(pos);
-            }
-            BoardCommand::LayEgg(pos, id) => {
-                e.add_egg(pos.0, pos.1, id);
-            }
-            BoardCommand::Hatch(egg_id, queen_id) => {
-                let egg = e.data.remove(&egg_id);
-                let pos = egg.unwrap().get_position();
-
-                let q = e.data.get_mut(&queen_id).unwrap();
-                let queen: &mut Queen = q.downcast_mut::<Queen>().unwrap();
-                queen.egg_count -= 1;
-                e.add_ant(pos.0, pos.1);
-            }
-            BoardCommand::Noop => {}
-        }
-    }
-}
-
-
 fn main() {
     let mut board = init_screen(); 
     let mut world = World::new();