Mysterious alignment
How can ancient monoliths that were aligned with the sun at the equinox thousands of years ago still be lined up, given that plate tectonics moves land masses over the years?
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Roger Bennett, Mansfield, Nottinghamshire, UK
Material change
What kinds of plastic are the most planet-friendly? And are biodegradable materials, such as those made from bamboo, preferable to recycled plastic, which makes use of the plastic waste that we already have?
Lynsey Harrison, Leeds, UK
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