Neurons in a zebrafish embryo
Zebrafish have proven invaluable for understanding what we know about nerves and the brain. Observing brain development and interrogating how growing neurons find their correct targets are possible thanks to the transparent, genetically malleable nature of zebrafish embryos. Recently, scientists have developed a technique called “Brainbow" that individually colors each neuron, allowing researchers to map the start and end points of neural circuits. Applying Brainbow to zebrafish will allow researchers to visualize how neurons connect with one another during development and how different diseases disrupt this process.
Image by Dr. Albert Pan, Harvard University.
The word sword comes from the Old English sweord, cognate to swert, "to wound, to cut".
The sword is symbolic of liberty and strength. In the Middle Ages, the sword was often used as a symbol of the word of God. The names given to many swords in mythology, literature, and history reflect the high prestige of the weapon and the wealth of the owner.