/u/Exotemporal's posts in /r/askscience

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270 tons of lead covered the roof of Paris' cathedral. Lead melts at 327°C, vaporizes at 1749°C and is highly toxic. Tons of water were thrown at it. The Seine river is close. Are we facing an environmental and public health disaster?

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Is it feasible to build a hollow sphere that's strong enough to maintain its shape when its interior is put under vacuum and that's light enough to be buoyant in air?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
270 tons of lead covered the roof of Paris' cathedral. Lead melts at 327°C, vaporizes at 1749°C and is highly toxic. Tons of water were thrown at it. The Seine river is close. Are we facing an environmental and public health disaster?	1
Is it feasible to build a hollow sphere that's strong enough to maintain its shape when its interior is put under vacuum and that's light enough to be buoyant in air?	1