diff --git a/src/site/snake/brain-neat.ts b/src/site/snake/brain-neat.ts
index 7db3b3e..f6a169f 100644
--- a/src/site/snake/brain-neat.ts
+++ b/src/site/snake/brain-neat.ts
@@ -419,7 +419,6 @@ export function chooseMate(genome: Genome, population: Population, config: MateC
     return genome;
 }
 
-// TODO: function crossGenomes(mom: Genome, dad: Genome, fitness: Map<Genome, number>) { ... }
 interface CrossConfig {
     reenable_rate: number;
 }
@@ -600,7 +599,7 @@ export function activate(n: number) {
     return 1 / (1 + Math.exp(-4.9 * n));
 }
 
-export class Organism {
+export class NEATBrain {
     genome: Genome;
     network: Network<Node<GeneData>>;
     order: NodeID[];
@@ -614,7 +613,7 @@ export class Organism {
     static fromGenome(genome: Genome) {
         const network = edgesToNodes(genome);
         const order = topoSort(network);
-        return new Organism(genome, network, order);
+        return new NEATBrain(genome, network, order);
     }
 
     /** given per-node input activations, computes downstream activations in-place.*/
diff --git a/src/test/test-brain-neat.ts b/src/test/test-brain-neat.ts
index 8d422ad..9994b8f 100644
--- a/src/test/test-brain-neat.ts
+++ b/src/test/test-brain-neat.ts
@@ -12,7 +12,7 @@ import {
     mutateNewConn,
     mutateNewNode,
     mutatePerturb,
-    Organism,
+    NEATBrain,
     Population,
     resetGlobalIDs,
 } from '../site/snake/brain-neat';
@@ -191,7 +191,7 @@ function testChooseSurvivors() {
     fitness.set(genomeF, 1); // adj = 1/1 = 1.00
 
     // (1 - 4/6) = 2/6 survive by fitness alone
-    // top organism (champion) from all species with at least 3 organisms should always survive
+    // top genome (champion) from all species with at least 3 genomes should always survive
     const sc = { survival_threshold: 4 / 6, champion_min_species_size: 3 };
     const survivors = chooseSurvivors(population, fitness, sc);
 
@@ -274,17 +274,17 @@ function testCrossGenomes() {
     assert(crossed[0]!.data.enabled === true);
 
     assert(crossed[1]!.data.innovation === 2);
-    assert(crossed[1]!.data.weight === 0 || crossed[0]!.data.weight === 1);
+    assert(crossed[1]!.data.weight === 0 || crossed[1]!.data.weight === 1);
     assert(crossed[1]!.data.enabled === true); // always re-enabled insce reenable_rate=1
 
     assert(crossed[2]!.data.innovation === 3);
-    assert(crossed[2]!.data.weight === 3 || crossed[0]!.data.weight === 2);
+    assert(crossed[2]!.data.weight === 3 || crossed[2]!.data.weight === 2);
 
     assert(crossed[3]!.data.innovation === 4);
     assert(crossed[3]!.data.weight === 9);
 
     assert(crossed[4]!.data.innovation === 5);
-    assert(crossed[4]!.data.weight === 5 || crossed[0]!.data.weight === 3);
+    assert(crossed[4]!.data.weight === 5 || crossed[4]!.data.weight === 3);
     assert(crossed[4]!.data.enabled === true); // always re-enabled since reenable_rate = 1
 
     // disjoint
@@ -398,7 +398,7 @@ function testFindAcyclicNewConns() {
 }
 addTest(testFindAcyclicNewConns);
 
-function testOrganismThink() {
+function testNEATBrainThink() {
     const genome = [
         { src_id: 'A', dst_id: 'C', data: { innovation: 1, weight: 0.3, enabled: true } },
         { src_id: 'B', dst_id: 'C', data: { innovation: 2, weight: 0.5, enabled: false } },
@@ -416,13 +416,13 @@ function testOrganismThink() {
     activations.set('A', expectedA);
     activations.set('B', expectedB);
 
-    const organism = Organism.fromGenome(genome);
+    const brain = NEATBrain.fromGenome(genome);
 
-    organism.think(activations);
+    brain.think(activations);
 
     assert(activations.get('A')! === expectedA);
     assert(activations.get('B')! === expectedB);
     assert(activations.get('C')! === expectedC);
     assert(activations.get('D')! === expectedD);
 }
-addTest(testOrganismThink);
+addTest(testNEATBrainThink);