New study sheds light on why opioids can cause gastrointestinal problems

Sir John Herschel used a solar wedge attached to his telescope to observe the Sun in the mid 19th century. A solar wedge reflects 4.5% of sunlight towards the eyepiece and a second glass filter reduces the Sun's white light by a factor of 1,000 or more

Citizen scientists from 200 years ago and today help shed light on climate change trends

News at a glance: Debate over classifying research, giant water lilies, and new hummingbird feather colors