Fluoride supplements have been used in the United States for decades and have proven to be safe and effective for decreasing cavities.

Oddly shaped deposits of tree resin point to massive waves that struck northern Japan roughly 115 million years ago and swept a forest into the sea.

The Teal Wand, an at-home HPV testing device that could replace a Pap smear, could broaden access to cervical cancer screening.

Researchers found the gene and genetic variation behind orange fur in most domestic cats, solving a decades-long mystery.

Not all plants can be stored in a seed bank. Cryopreservation offers an alternative, but critics question whether this form of conservation will work.

A faint yet visible Martian aurora is the first instance of the phenomenon spotted from another planet's surface.

Placebo testing has been part of the process since the 1940s. It’s unclear what additional measures would achieve — but it may slow development.

It's not quite as bad as The Last of Us. But progress has been achingly slow in developing new antifungal vaccines and drugs.

In 2018, over 350,000 excess heart disease deaths were linked to phthalates. More research is needed to fully understand the chemicals' effects.

Shape and symmetry help determine where a leaf lands — and if the tree it came from can recoup the leaf’s carbon as it decomposes.

Chimpanzees combine hoots, calls and grunts to convey far more concepts than with single sounds alone. It may be a first among nonhuman animals.

This assassin bug's ability to use a tool — bees’ resin — could shed light on how the ability evolved in other animals.