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NASA's Ingenuity helicopter unlocked its rotor blades, allowing them to spin freely, on April 7, 2021, the 47th Martian day, or sol, of the mission. They had been held in place since before launch, and the unlocking is one of several milestones that must be met before the helicopter can attempt the first powered, controlled flight on another planet. This image was captured by the Mastcam-Z imager on NASA's Perseverance Mars rover on the following sol, April 8, 2021.

Technology

2021 in review: A helicopter flies on Mars for the first time

The world鈥檚 hardest word search: Life, the universe and everything

Humans

Strange but true? Test yourself in our barely believable science quiz

How do humans affect the nitrogen cycle?

Health

Covid-19 news archive: September to October 2021

Humans

13 of the most profound questions about the cosmos and ourselves

Roman statue

Humans

Ancient Roman statues discovered during HS2 high-speed railway dig

grilled tofu and dragon fruit

Environment

Eat less meat and fly less to help climate, says Patrick Vallance

Woman flexing muscles in front of a superhero shadow

How can I make myself more motivated?

How spiteful are you?

A phone with an error message

Technology

Facebook, WhatsApp and Instagram back online after global outage

Artists impressions of the Spinosaurids. Ceratosuchops inferodios in the foreground, Riparovenator milnerae in the background.

Life

‘Hell heron’ dinosaur is new species found on Isle of Wight