The artifact based on bad mythology is always found at the exact time of the heavenly event, based on bad astronomy, that makes it Very Dangerous.
Also, heroes have a "good luck" power- any scientists they visit will make a remarkable discovery while the hero is around.

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"If you think the LHC will create black holes, you might as well believe Hobbits are at the bottom of your garden."- Dr. Mike Inglis
Rovers forever! - ToSeek
"Carl Sagan sent a message to ET,
Neil Armstrong walked in the Sea of Tranquility
Steve Squyers built Spirit and Opportunity
Dan Haylen upchucked in zero gravity." -Brent Simon, The Space Camp Song