If you buy something using links in our stories, we may earn a commission. Learn more. Equations relating speed and mass go back to Newton and beyond. But after I got geeky with an equation for ...

In the week after Easter, we had a lot of old Peeps lying around. No one seemed that interested in eating them, so we used them to measure the speed of light. For centuries the speed of light was an ...

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If you just celebrated Easter, you might have some stale marshmallow Peeps lying around the house. And if you want to avoid eating those Peeps, they are the perfect material for a science experiment ...