Here's What the Tip of the Washington Monument Looks Like Up Close

The 129-year-old Washington Monument is enshrouded in scaffolding this month, as workers repair the structural cracks caused by a a 2011 earthquake. But the scaffolds are giving scientists the chance to carry out other work, too: Like measuring the exact height of the aging monument. » 11/12/13 10:40am 11/12/13 10:40am