Yes so they claim, and you believe that claim, but I don't, can you handle that ??.
A scientist doesn't claim anything. They must first prove something through testing, that proof must then be sent to a bunch of other independent scientists for verification. These independent Scientists test this evidence vigorously. If it passes that strenuous test, then it is published as evidence of something. These are the supposed "claims" you are denying. Verified pieces of evidence given by a number of people in a number of Scientific Disciplines around the world.