diff --git a/scripts/run_simulation.jl b/scripts/run_simulation.jl
index af80c61..84e01c2 100644
--- a/scripts/run_simulation.jl
+++ b/scripts/run_simulation.jl
@@ -6,7 +6,9 @@ using .Constants
 # Parameters and initial conditions
 N = 128
 dx = 1.0
+# diffusion rates of substance 'u' and 'v'
 Du, Dv = Observable(0.16), Observable(0.08)
+# feed rate of 'u' and kill rate of 'v'
 F, k = Observable(0.060), Observable(0.062)
 dt = 1.0
 params_obs = Observable(GSParams(N, dx, Du[], Dv[], F[], k[]))
@@ -16,6 +18,7 @@ function update_params!(params_obs, u, v, feed, kill)
     params_obs[] = GSParams(old.N, old.dx, u, v, feed, kill)
 end
 
+# Whenever a value gets changed via the textbox, update params object to reflect changes in simulation
 lift(Du, Dv, F, k) do u, v, F, k
     update_params!(params_obs, u, v, F, k)
 end
@@ -23,6 +26,7 @@ U = ones(N, N)
 V = zeros(N, N)
 center = N ÷ 2
 radius = 10
+# set a cube in the center with starting concentrations for 'u' and 'v'
 U[center-radius:center+radius, center-radius:center+radius] .= 0.50
 V[center-radius:center+radius, center-radius:center+radius] .= 0.25
 
@@ -85,8 +89,11 @@ gh = GridLayout(fig[1, 1])
 ax = Axis(gh[1, 1])
 
 hm = Makie.heatmap!(ax, heat_obs, colormap=:viridis)
+Makie.deactivate_interaction!(ax, :rectanglezoom)
 ax.aspect = DataAspect()
 
+spoint = select_point(ax.scene)
+
 # # Controls
 run_label = Observable("Run")
 fig[2, 1] = buttongrid = GridLayout(tellwidth=false)
@@ -126,32 +133,26 @@ function reset!(U, V, heat_obs)
     heat_obs[] = copy(U)
 end
 
-function animation_loop()
-    while running[]
-        # step!(U, V)
+on(running) do r
+    run_label[] = r ? "Pause" : "Run"
+end
+
+# Button Listeners
+on(btn_step.clicks) do _
+    multi_step!((U, V), 30)
+end
+
+on(btn_start.clicks) do _
+    running[] = !running[]
+end
+
+on(btn_start.clicks) do _
+    @async while running[]
         multi_step!((U, V), 30)
         sleep(0.05)  # ~20 FPS
     end
 end
 
-on(running) do r
-    run_label[] = r ? "Pause" : "Run"
-    end
-
-
-on(btn_step.clicks) do _
-    multi_step!((U, V), 30)
-end
-on(btn_start.clicks) do _
-    running[] = !running[]
-end
-on(btn_start.clicks) do _
-    @async while running[]
-        animation_loop()
-    end
-end
-
-
 on(btn_reset.clicks) do _
     running[] = false
     reset!(U, V, heat_obs)