Neurological research has demonstrated that brain growth and development continue into old age - the concept known as neuroplasticity of aging.

I love that concept because it's ignorant to think you know everything about a person.

The arithmetic mean, although a concept known to the Greeks, was not generalised to more than two values until the 16th century.

Physicists have one more symmetry card to play, a concept known as supersymmetry.

And the concept behind it, I thought, okay, well, we know that, like, if you used all lower case, that's obviously weak.

The concept of an audiobook as we know it is about 50 years old.

"What a great concept to get a great reading and to know that my kid is taken care of."

Many companies permit employees to work when they choose, a concept known as flex time.

A concept he doesn't seem to remember or maybe have never known.

"For the generations now, the whole concept of the children's library as we have known and loved it doesn't resonate the same way."