Small Device Uses Sound to Help Liquids Spread

Spread farther. The passage says the liquid spread farther when ultrasound was used in the tests.

Clue: MIT scientists made a brain device that uses a tube and ultrasound, a sound people cannot hear. In tests on mice and tissue-like gel, ultrasound helped liquid spread farther.

A substance that makes scans clearer. The tested substance helped with scans; the article says it was not a cancer drug.

Clue: The mouse test used a substance that makes scans clearer, not a cancer drug. Researchers hope a future version could deliver medicine after tumor surgery. It is not a proven treatment.