Read the excerpt from "A Byte Out of History.”

It’s a mystery, frankly. We’ve run down thousands of leads and considered all sorts of scenarios. And amateur sleuths have put forward plenty of their own theories. Yet the case remains unsolved.

And what of some of the names pegged as Cooper? None have panned out. Duane Weber, who claimed to be Cooper on his deathbed, was ruled out by DNA testing (we lifted a DNA sample from Cooper’s tie in 2001). Kenneth Christiansen, named in a recent magazine article, didn’t match the physical description and was a skilled paratrooper. Richard McCoy, who died in 1974, also didn’t match the description and was at home the day after the hijacking having Thanksgiving dinner with his family in Utah, an unlikely scenario unless he had help.

Which detail in the excerpt supports the central idea that the case is still interesting to many?

The FBI has followed many leads and scenarios.
Several men were investigated as potential suspects.
Amateur detectives continue to investigate the case.
There is a DNA sample from Cooper’s tie.

The detail in the excerpt that supports the central idea that the case is still interesting to many is "Amateur detectives continue to investigate the case."

The detail in the excerpt that supports the central idea that the case is still interesting to many is: Amateur detectives continue to investigate the case.

This detail suggests that despite the FBI's efforts and the ruling out of certain suspects, ordinary people who have an interest in the case are actively involved in investigating and offering their own theories. This shows that the case still holds fascination for many, contributing to its ongoing intrigue.

The detail in the excerpt that supports the central idea that the case is still interesting to many is the fact that amateur detectives continue to investigate the case.