Science is a method of making a claim, testing it with vivid experiments, testing it more, recording observations, wait for other people to test the claim with their own experiments, and if the tests happen to agree with the claims, it becomes a consensus.
You can participate in the scientific verification of a claim by
1) By testing it yourself using proper scientific method and proper lab equipment. President requisite is education.
2) If you can't afford that, then wait for scientific community to test that. If there is a consensus of statistical certainty from the various scientific institutions you trust, then you can choose to form your facts around those.