Doubts about carbon dating
If you ever wondered why nuclear tests are now performed underground, this is why. Well, there were no nearby supernovae that happened at that time, so that’s out.
With a half-life of just over 5,000 years, any Carbon-14 atoms that were created in stars, billions of years ago, have long since decayed away into nitrogen atoms.
Well, if carbon-14 can decay into nitrogen-14 and other stuff, then we can create carbon-14 by combining nitrogen-14 with the proper stuff.
In this case, that happens to be a neutron, which allows us to do this: (a.k.a., carbon dioxide) and mixing throughout the atmosphere and oceans, easily making its way into living organisms into a well-understood equilibrium.
Ever since, it has been publicly exhibited only rarely, as, in recent times, on the marriage of Prince Umberto (1931) and on the 400th anniversary of its arrival in Turin (1978).
Scholarly analyses—attempting to use scientific methods to prove or disprove its authenticity—have been applied to the shroud since the late 19th century.Measuring 14 feet 3 inches long and 3 feet 7 inches wide, it seems to portray two faint brownish images, those of the back and front of a gaunt, sunken-eyed, 5-foot 7-inch man—as if a body had been laid lengthwise along one half of the shroud while the other half had been doubled over the head to cover the whole front of the body from face to feet.