talldwarf/Alamy
Why do we start growing copious amounts of ear, nose and eyebrow hair as we get older? How can this possibly help us survive in our twilight years?
David Bloomquist
Venice, Florida, US
E. Wernquist / D. Nelson (IllustrisTNG Collaboration)/M. Oei
What would happen if a black hole jet hit the sun or Earth?
Doug Kalning
Cary, North Carolina, US
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