• Why are some people left-handed?
  Most people are right-handed because the left side of their brain is ...

• Why do you need to sleep?
  A 10-year-old sleeps on average nine or 10 hours a night, but sleep ...

• How often do you dream?
  You probably dream about five times every night, but you are only ...

• Why do some people sleepwalk?
  People may walk in their sleep because they are worried or anxious. ...

• Does the brain ever rest?
  Even while you are asleep the brain carries on controlling body ...

• How does a nerve work?
  A chain of nerve cells carries a signal to or from the brain. The ...

• What is the spinal cord?
  The spinal cord is the largest nerve in the body. It is 3/4 in (2 cm) ...

• How do anesthetics work?
  An anesthetic stops you feeling. A local anesthetic deadens the ...

• How many nerves do you have?
  Thousands of millions of nerves reach out to all parts of the body.

• Which is the longest nerve?
  The longest nerve is the tibial nerve. It runs alongside the tibia ...