diff --git a/actors/slush.go b/actors/slush.go
index 598eb6b..c1e0f39 100644
--- a/actors/slush.go
+++ b/actors/slush.go
@@ -8,33 +8,34 @@ import (
 
 type Slush struct {
 	color int
+	Probability float32
 }
 
 func (sm *Slush) Setup(env *core.Environment, t *core.Turtle) {
-	sm.color = rand.Intn(2) + 1
-	if sm.color !=1 && sm.color !=2 {
-		panic("wrong color")
+	num := rand.Intn(100)
+	if num >= int(sm.Probability*100.0) {
+		sm.color = 2
+	} else {
+		sm.color = 1
 	}
 }
 
 func (sm *Slush) Run(env *core.Environment, t *core.Turtle) {
 	t.Wiggle()
-	notChanged := true
-	threshold := float32(1.0)
-	for notChanged {
-		notChanged = false
-		if t.Near(env, 1, threshold, "1") {
+	am1 := t.Amount(env,1,"1")
+	am2 := t.Amount(env,1,"2")
+
+	t.Drop(env, 1, strconv.Itoa(sm.color))
+
+
+	if am1 > 3 || am2 > 3 {
+		if am1 > am2 {
 			sm.color = 1
-			notChanged = true
-		}
-		if t.Near(env, 1, threshold, "2") {
+		} else if am2 > am1 {
 			sm.color = 2
-			notChanged = true
 		}
-		threshold+=0.01
 	}
 	t.Step(env)
-	t.Drop(env, 1, strconv.Itoa(sm.color))
 }
 
 
diff --git a/actors/snowball.go b/actors/snowball.go
deleted file mode 100644
index 8ca0889..0000000
--- a/actors/snowball.go
+++ /dev/null
@@ -1,40 +0,0 @@
-package actors
-
-import (
-	"git.openprivacy.ca/sarah/microworlds/core"
-	"math/rand"
-	"strconv"
-)
-
-type Snowball struct {
-	color int
-	sureness int
-}
-
-func (sm *Snowball) Setup(env *core.Environment, t *core.Turtle) {
-	sm.color = rand.Intn(2) + 1
-	if sm.color !=1 && sm.color !=2 {
-		panic("wrong color")
-	}
-	sm.sureness = 0
-}
-
-func (sm *Snowball) Run(env *core.Environment, t *core.Turtle) {
-	t.Wiggle()
-	if sm.color == 1 && t.Near(env, 1, float32(sm.sureness), "1") {
-		sm.sureness++
-	} else if sm.color == 1 && t.Near(env, 1, float32(sm.sureness), "2") {
-		sm.sureness = 0
-		sm.color = 2
-	} else if sm.color == 2 && t.Near(env, 1, float32(sm.sureness), "2") {
-		sm.sureness++
-	} else if sm.color == 2 && t.Near(env, 1, float32(sm.sureness), "1") {
-		sm.sureness = 0
-		sm.color = 1
-	}
-	t.Step(env)
-	t.Drop(env, 1, strconv.Itoa(sm.color))
-}
-
-
-
diff --git a/core/turtle.go b/core/turtle.go
index 269aaa8..d3451f9 100644
--- a/core/turtle.go
+++ b/core/turtle.go
@@ -67,6 +67,37 @@ func (t *Turtle) Drop(env *Environment, amount float32, pheromone string) {
 	env.Mark(pheromone, t.xpos, t.ypos, amount)
 }
 
+func (t *Turtle) Amount(env *Environment, distance int, pheromone string) float32 {
+	h0 := t.heading - 1
+	if h0 < 0 {
+		h0 = 7
+	}
+
+	dx0 := headings[h0][0] * distance
+	dy0 := headings[h0][1] * distance
+
+	x0 := (t.xpos + dx0)
+	y0 := (t.ypos + dy0)
+
+	dx := headings[t.heading][0] * distance
+	dy := headings[t.heading][1] * distance
+
+	x := (t.xpos + dx)
+	y := (t.ypos + dy)
+
+	h1 := (t.heading + 1) % 8
+	dx1 := headings[h1][0] * distance
+	dy1 := headings[h1][1] * distance
+
+	x1 := (t.xpos + dx1)
+	y1 := (t.ypos + dy1)
+
+	as0 := env.SniffNormalized(x0, y0, pheromone)
+	as := env.SniffNormalized(x, y, pheromone)
+	as1 := env.SniffNormalized(x1, y1, pheromone)
+	return as0+as+as1
+}
+
 func (t *Turtle) Near(env *Environment, distance int, threshold float32, pheromone string) bool {
 	h0 := t.heading - 1
 	if h0 < 0 {
diff --git a/main.go b/main.go
index 4fc501c..3546295 100644
--- a/main.go
+++ b/main.go
@@ -23,6 +23,8 @@ var height = flag.Int("height", 300, "height of environment")
 var pxsize = flag.Int("pxsize", 1, "pixels per tile edge")
 var numTurtles = flag.Int("numTurtles", 5000, "number of turtles")
 
+var prob = flag.Float64("distribution", .51, "number of turtles")
+
 func main() {
 
 	// We don't need real randomness
@@ -93,20 +95,12 @@ func main() {
 		g.ColorPheromone("trail", [4]uint8{0x81, 0, 0x81, 0x00})
 	case "slush":
 		for i := 0; i < *numTurtles; i++ {
-			turtles[i] = core.NewTurtle(env, &actors.Slush{})
+			turtles[i] = core.NewTurtle(env, &actors.Slush{Probability:float32(*prob)})
 		}
 		env.InitPheromone("1")
 		env.InitPheromone("2")
 		g.ColorPheromone("1", [4]uint8{0x80, 0xFF, 0x00, 0x00})
 		g.ColorPheromone("2", [4]uint8{0xFF, 0, 0xFF, 0x00})
-	case "snowball":
-		for i := 0; i < *numTurtles; i++ {
-			turtles[i] = core.NewTurtle(env, &actors.Snowball{})
-		}
-		env.InitPheromone("1")
-		env.InitPheromone("2")
-		g.ColorPheromone("1", [4]uint8{0x00, 0xFF, 0xFF, 0x00})
-		g.ColorPheromone("2", [4]uint8{0xFF, 0xFF, 0x00, 0x00})
 	case "flocking":
 		for i := 0; i < *numTurtles; i++ {
 			turtles[i] = core.NewTurtle(env, &actors.Flocking{SniffDistance: 1})