In winter, salt is regularly applied to melt ice on roads in the Northeast. But road salt runoff drains into streams and drinking water. Scientists have been testing freshwater in three regions of the Northeast for thirty years. The salt buildup has made some urban, suburban, and rural streams 25 percent as salty as seawater.
Did you know that when you look at a star, your eyes are capturing light that traveled all the way from the star to your eye? Learn more about how light carries information from distant objects.
White light is a mixture of all colors of visible light, but it doesn't always include every color of the rainbow. Build a spectroscope, and view the spectral fingerprints of different light sources.
It probably comes as no surprise that telescopes do a better job of collecting light and observing outer space than your eyes. But do you know why? (Hint: the answer is NOT magnification!)
Living on land as we do, it's easy to forget this is a water planet. Yet life appeared about 3.5 billion years ago in the ocean, and instead of leaving, most things stayed there.
What makes a great diorama? Learn how this museum artist had to develop new techniques in order to create background paintings.
When in comes to breathing under water, marine organisms breathe in different ways. Some absorb oxygen through their skin, some rely on gills, and others gulp air into their gas bladders.
Classroom Activity, Hands-on Activity
Natural selection plays a large role in the evolution of a species. The following activity demonstrates this concept.
What should you think about before selecting a site to study? The answer depends on what you want to know. Get tips from working scientists about how to hone in on the perfect site for you.
When it comes to identifying plant species, making mistakes is part of the process. That's why this botanist and curator recommends, "Never erase anything!"