Overall, the vaccine was 52% effective after the first dose and 95% effective after the second dose.
Overall, the vaccine was 52% effective after the first dose and 95% effective after the second dose.
A new treatment could restore some mobility in people paralyzed by strokes 
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This robot automatically tucks its limbs to squeeze through spaces 
Greta Thunberg’s new book urges the world to take climate action now 
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A chemical imbalance doesn’t explain depression. So what does?