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Readers discuss dark energy, Ötzi’s tattoos and sneaky plant invasions
Tattoos Linked to Increased Cancer Risk, Scientists Warn
How Ötzi the Iceman really got his tattoos
Found evidence that Ötzi the Iceman’s tattoos were done using a single-ended tool
Artist Tattooed Himself to Solve Mystery of Ötzi The Iceman's Tattoos
We May Have Decoded a Sacred Motif in Ancient Egyptian Mummy Tattoos
Protective childbirth tattoos found on ancient Egyptian mummies
Painless Tattoos Developed – Easy, Do-It-Yourself Microneedle Patches
