diff --git a/history/004_seasaw/src/main/java/com/github/drinkjava2/frog/brain/organ/Active.java b/history/004_seasaw/src/main/java/com/github/drinkjava2/frog/brain/organ/Active.java
new file mode 100644
index 0000000..6724647
--- /dev/null
+++ b/history/004_seasaw/src/main/java/com/github/drinkjava2/frog/brain/organ/Active.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2018 the original author or authors. 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
+ * applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+ * OF ANY KIND, either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ */
+package com.github.drinkjava2.frog.brain.organ;
+
+import com.github.drinkjava2.frog.Frog;
+import com.github.drinkjava2.frog.brain.Cell;
+import com.github.drinkjava2.frog.brain.Input;
+import com.github.drinkjava2.frog.brain.Organ;
+
+/**
+ * Active always keep active
+ * 
+ * 这个器官永远激活
+ */
+public class Active extends Organ {//以前的实验发现添加一个始终激活的区比用Hungry来驱动更能提高找食效率
+
+	private static final long serialVersionUID = 1L;
+
+	@Override
+	public void initFrog(Frog f) {
+		if (!initilized) {
+			initilized = true;
+			organOutputEnergy = 2;
+		}
+	}
+
+	@Override
+	public void active(Frog f) {
+		for (Cell cell : f.cells) {
+			if (cell.energy > 0)
+				cell.energy--;
+			if (cell.energy < Cell.MAX_ENERGY_LIMIT)
+				for (Input input : cell.inputs)
+					if (input.nearby(this)) // if input zone near by happy zone
+						cell.energy += organOutputEnergy;
+		}
+	}
+
+}