Nova

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Mars was once a blue water world studded with active volcanoes.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Thousands of engineers, technicians and workers race to build Europe's biggest construction project-London's new railroad, the Elizabeth Line.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Mars was once a blue water world studded with active volcanoes.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Mars was once a blue water world studded with active volcanoes.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Dogs have long been dependable companions by our sides.

Worshiped as a goddess, condemned as satanic and spun into a stunning array of breeds, cats have long fascinated humans.

Jupiter's massive gravitational force made it a wrecking ball when it barreled through the early solar system.

Dogs have long been dependable companions by our sides.

Worshiped as a goddess, condemned as satanic and spun into a stunning array of breeds, cats have long fascinated humans.

Dogs have long been dependable companions by our sides.

Worshiped as a goddess, condemned as satanic and spun into a stunning array of breeds, cats have long fascinated humans.

Dogs have long been dependable companions by our sides.

Following a trail of fossils found in all the wrong places -- beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic -- uncover the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

Worshiped as a goddess, condemned as satanic and spun into a stunning array of breeds, cats have long fascinated humans.

A visionary astronomer in West Africa attempts a high-stakes observation of a distant asteroid vital to a NASA mission.

Dogs have long been dependable companions by our sides.

Worshiped as a goddess, condemned as satanic and spun into a stunning array of breeds, cats have long fascinated humans.

Jupiter's massive gravitational force made it a wrecking ball when it barreled through the early solar system.

Dogs have long been dependable companions by our sides.

Worshiped as a goddess, condemned as satanic and spun into a stunning array of breeds, cats have long fascinated humans.

Jupiter's massive gravitational force made it a wrecking ball when it barreled through the early solar system.

NASA's Cassini explores Saturn for 13 years, looping through its icy rings and flying by its moons.

Is what you see real? Join neuroscientist Heather Berlin on a quest to understand how your brain shapes your reality, and why you can't always trust what you perceive.

Are you in control of your brain, or is your brain controlling you? Dive into the latest research on the subconscious with neuroscientist Heather Berlin to see what's really driving the decisions you make.

Is what you see real? Join neuroscientist Heather Berlin on a quest to understand how your brain shapes your reality, and why you can't always trust what you perceive.

Are you in control of your brain, or is your brain controlling you? Dive into the latest research on the subconscious with neuroscientist Heather Berlin to see what's really driving the decisions you make.

In July 2022, NASA's James Webb Space Telescope released its first images, looking further back in time than ever before to show our universe in stunningly beautiful detail.

Is what you see real? Join neuroscientist Heather Berlin on a quest to understand how your brain shapes your reality, and why you can't always trust what you perceive.

Are you in control of your brain, or is your brain controlling you? Dive into the latest research on the subconscious with neuroscientist Heather Berlin to see what's really driving the decisions you make.

NASA's Cassini explores Saturn for 13 years, looping through its icy rings and flying by its moons.

Is what you see real? Join neuroscientist Heather Berlin on a quest to understand how your brain shapes your reality, and why you can't always trust what you perceive.

Are you in control of your brain, or is your brain controlling you? Dive into the latest research on the subconscious with neuroscientist Heather Berlin to see what's really driving the decisions you make.

In the far reaches of the solar system, Uranus and Neptune dazzle with unexpected rings, supersonic winds and dozens of moons.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

In the far reaches of the solar system, Uranus and Neptune dazzle with unexpected rings, supersonic winds and dozens of moons.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

In the far reaches of the solar system, Uranus and Neptune dazzle with unexpected rings, supersonic winds and dozens of moons.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Sixty-six million years ago, an asteroid wiped out the dinosaurs in a fiery global catastrophe.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

After decades in the shadows, UFOs are being studied seriously.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm.

Deep in the Cambodian jungle lie the ruins of Angkor, a marvel of urban engineering and seat of the once-mighty Khmer Empire.

Deep in the Cambodian jungle lie the ruins of Angkor, a marvel of urban engineering and seat of the once-mighty Khmer Empire.

Deep in the Cambodian jungle lie the ruins of Angkor, a marvel of urban engineering and seat of the once-mighty Khmer Empire.