A hand stencil left on an Indonesian cave wall at least 67,800 years ago may reveal how and when ancient humans reached a ...

Amid concerns about President Donald Trump’s health and cognitive decline, he bragged about “acing” several cognitive tests at a North Carolina event. During his speech on Friday, December 19, the ...

But Why is a show led by kids. They ask the questions and we find the answers. It’s a big interesting world out there. On But Why, we tackle topics large and small, about nature, words, even the end ...

Memory is the faculty by which the brain encodes, stores, and retrieves information. It is a record of experience that guides future action. Memory encompasses the facts and experiential details that ...

A version of this article appeared in the October 2006 issue of Harvard Business Review. Harvard Business Publishing: Copyright ©2026 Harvard Business School ...