Black holes are distortions in the fabric of space (Credit: Henning Dalhoff/SPL)
The strange fate of a person falling into a black hole
If you fell into a black hole, you might expect to die instantly. But in fact your fate would be far stranger than that
The formation of the Earth (Credit: Take 27 Ltd / Science Photo Library)
The 25 biggest turning points in Earth's history
Our planet has existed for 4.5 billion years, and it has been a busy few eons. Here are the 25 biggest milestones in Earth's history. From leaps forward in evolution to devastating asteroid impacts, these were the turning points that shaped our world
A portrait of the bird-like Archaeopteryx dinosaur (Credit: Stocktrek Images Inc/Alamy)
Chicken grows face of dinosaur
A chicken embryo with a dinosaur-like snout instead of a beak has been developed by scientists
Paramacrobiotus craterlaki (Credit: Eye of Science/Science Photo Library)
Tardigrades return from the dead
Boil them, deep-freeze them, crush them, dry them out or blast them into space: tardigrades will survive it all and come back for more
A scanning electron micrograph of Demodex folliculorum (Credit: Eye of Science/SPL)
These microscopic mites live on your face
We all seem to have Demodex mites living on our faces. Far from being harmful, these uninvited guests could reveal our evolutionary history
HIV particles infecting a cell (Credit: Animated Healthcare Ltd/SPL)
We know the city where HIV first emerged
When HIV and AIDS appeared they seemed to come from nowhere, but genetics has told us when and where the virus first entered the human population
Male lions sometimes engage in homosexual behaviour (Credit: AfriPics.com / Alamy)
Are there any homosexual animals?
Lots of animals engage in homosexual behaviour, but whether they are truly homosexual is another matter entirely
An adult pigeon (Credit: Robert Claypool/CC by 2.0)
Why don't you ever see baby pigeons?
BBC Earth sets out to answer those little, inconsequential questions that secretly bother us all
A blue whale (Balaenoptera musculus) diving (Credit: age fotostock/Alamy)
The world's loneliest whale may not be alone after all
For years a mysterious whale with a unique song was tracked in the Pacific Ocean. Is it still out there? And is it really alone?
Menstruation can be painful (Credit: RGB Ventures/SuperStock/Alamy)
Why do women have periods when most animals don't?
Apart from humans and our close relatives, the only animals that menstruate are elephant shrews and certain bats. Why did it only evolve in these species?
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