Exactly how tall is Mount Everest? That’s what scientists in India are trying to figure out.

This week, India’s surveyor general announced that the government is going to remeasure Mount Everest, in a bid to determine whether the world’s tallest peak shrank (or grew) following a devastating earthquake in 2015. The expedition is the first Indian survey of the mountain in more than 60 years, but experts say obtaining an accurate measurement will be a tall order, and determining the earthquake’s effect on it may be even tougher.

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