KANSAS CITY, Missouri (AP) — An effort to help the family of a 5-month-old Missouri boy with cancer has inspired thousands of people across the U.S. and even abroad to take a plunge into cold bodies of water.Organizers of the Facebook-based Plunge for Landon fundraiser said they have lost count of how many people have posted videos of themselves taking a dive for Landon Shaw, an infant from Tarkio, Missouri, who was diagnosed in late February with a rare form of cancer. People are jumping in, from chilly farm ponds north of Kansas City to the Gulf of Mexico and the Potomac River in Washington, D.C.“I can’t believe how viral this is going,” said Alyssa Shaw, Landon’s mom. “My son has been such an inspiration to everybody and opened up people’s eyes that you can’t take life for granted.”Before they jump into the water, participants record themselves challenging three other people to do the same, with monetary pledges for each person who completes the challenge.