Many of the dramatic images he created for science are now found in art museums worldwide.

Dramatic changes began in the 18th century.

These deficits include memory impairments, a diminished ability to make decisions, and dramatic lapses in attention.

The obvious superiority of their search engine quickly attracted financial backing.

One obvious tactic was to sell advertising space on Google's home page.

Although he kept looking up eagerly at the sky, it was obvious that he could see nothing.

I shall be alone with that mad woman upstairs.

Because I was never with him when he was alone,' the witness answered.

He is now alone on a small island.

Ancient humans depended on the powers of nature to help them survive.

About 4,000 years ago, ancient Egyptians developed a 12-hour time system.

Narcissus was the name of a character in an ancient Greek story.

Some researchers have inferred that faulty connections between areas of the brain may be responsible for autism.

Isolating which part of the brain is responsible for moving your big toe is a neat trick.

Who is responsible?' '