Sesame Street ran a special segment 20 years ago to warn kids about the dangers of lead, and twenty years later Last Week Tonight's John Oliver brings them back for the same problem. Oliver informed Elmo and friends about the likely cost of fixing the problem and informed them that the issue is not just isolated to Flint, MI.

However, the dangers of lead extend beyond the water and into the home where children are exposed to lead paint—at least 2.1 million  homes have lead paint exposure risk and kids under 6 years old:

As Oliver explained, this is very dangerous: "Lead [is] the most dangerous thing in Led Zeppelin's name," Oliver said, "and I will remind you the other thing was zeppelin." He later added, "There is no safe level of lead. It's one of those things so dangerous you shouldn't even let a little bit inside you. … Even low-level exposure can lead to irreversible damage, like lower IQs, antisocial behavior, and reduced attention span."

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