References

Find out everything about adenoviruses, from what they are and what symptoms to watch out for to how adenoviruses are used in vaccines, such as those for COVID-19.

Despite a lack of hard evidence, some people believe that Bigfoot, also called Sasquatch, is a giant ape-like creature that roams North America.

Cheetahs are unique members of the big cat family, with bodies built for acceleration and short bursts of incredible speed.

Gagarin became the first of humankind to blast off into space on April 12, 1961, but rumors continue to circulate that another cosmonaut had beaten him to the punch days before.

Find out what black holes are, who discovered them, how we know they exist and what would happen if you fell into a black hole.

Chimpanzees are one of our closest living relatives and share many of the same traits as humans. They are highly intelligent and social creatures, but they are also capable of extreme violence.

The coyote is a clever animal that has adapted well to growing human populations and habitat loss.

Billions of periodical cicadas, known as Brood X, will emerge across the eastern U.S. in 2021.

DNA is a molecule that contains the instructions an organism needs to develop, live and reproduce.

Orcas, or killer whales, are the largest of the dolphin family.

From politics to protests, women have shaped the world we live in today. These 10 stand out above the rest.

Here are some tips for how to get pregnant successfully, including information on how to conceive if you have PCOS or endometriosis.

These are the most common temperature scales, their history, and their use

Equinoxes occur twice a year when the sun is directly above the equator, and signal herald the beginning of spring and autumn.

Since days of yore, the royal line of succession to the British throne — like most monarchies — was based on primogeniture.

On Feb. 23, 1945, six Marines raised the U.S. flag over the Japanese island of Iwo Jima. Their photo is one of the most iconic images of World War II.

Mary Anning's discoveries shocked the 19th-century scientific establishment. But her gender, poverty and lack of formal education meant she often didn't get credit for her work.

Fought on a tiny volcanic island 76 years ago, this brutal clash between American and Japanese forces defined the horror of the Pacific theater.

This political activist and minister challenged the conventions of race and religion during the early years of the civil rights movement.