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A comment on 311 years ago, Alexander Selkirk was rescued on a desert island. Parent comment

Re:311 years ago, Alexander Selkirk was rescued on a desert ... by xxs on Sunday February 02, 2020 @05:17AM (#22216220)
All you need is a lens given a bright day. I used to ignite paper as a kid. It should be possible to use ice as well but it has to be properly shaped and the water to be clear.
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Re:311 years ago, Alexander Selkirk was rescued on a desert ... by iamthirsty on Sunday February 02, 2020 @05:23AM (#22216247)
Doesn't really seem like ice would be abundant on a desert island.
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