Science News Quiz #7

A new study shows that one litre of water from a single-use plastic bottle contains roughly a quarter million particles of plastic, most of which are so small they can likely pass into your bloodstream and tissues across the lining of the intestines.

Which of the following is the smallest size of plastic?

A new study shows that for people who have hearing loss, wearing a hearing aid all the time can reduce mortality risk by 24% compared to never wearing a hearing aid.

In the US, roughly what percentage of people with hearing loss use hearing aids on a regular basis?

NASA has thrown some money at a project that would send a huge array of teeny tiny spaceships all the way to other stars. With conventional rockets, that would take about 80,000 years. But these aren't rocket-propelled. They'd each weigh just a few grams, and be pushed by a powerful laser from Earth, hitting their sail. The proposal says we could even to the nearest star by around 2075!

What's the closest star to Earth, other than the sun?