But e-bikes containing lithium-ion batteries are a newer challenge. "When a battery fails, it doesn't necessarily ignite, it will often produce some off-gases," says Stephen Welch, senior lecturer at the University of Edinburgh's Fire Research Centre. "Those off-gases are toxic and flammable. If they accumulate, you can have an explosion risk."
It sounds like a contradiction, but for Carroll, it's the difference between destiny and graft.
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The selected acts will be revealed in April, and the star-studded induction ceremony will take place in Cleveland, Ohio, in the autumn.
So far 58 skeletons, dating to the 6th or 7th Century, have been uncovered at the site. What's unusual is that nearly all belonged to women.
Hansen said he hoped the mission would inspire the world.