There are lots of things kids don’t like about doctor’s visits, with shots, blood tests and throat swabs topping the list. But one thing they love is having their knee reflexes checked. A reflex is an ...

There are lots of things kids don’t like about doctor’s visits; shots, blood tests and throat swabs top the list. One thing they love is having their knee reflexes checked. A reflex is an involuntary, ...

We are, I trust, all but universally familiar with the knee jerk, or patellar, reflex. A doctor taps the patellar tendon with a rubber mallet, and our leg kicks forward in response. The reaction is ...