Actually pretty easy. Trees don’t reject tissue from other trees in the same family. You bend the tree to another tree when it is a sapling, scrape off the bark on both trees where they touch, add some damp sphagnum moss around them to keep everything slightly moist and bind them together. Then wait a few years- The trees will have grown together.
You can use a similar technique to graft a lemon branch or a lime branch or even both- onto an orange tree and have one tree that has all three fruits.
This is fake. They haven’t been sat on that rock for 50 years. If you look closely you can clearly see her swimsuit is different in the second photo, it has stripes on it. And the guy’s shorts seem to have a more floral pattern in the latter photo.Also, if someone sat on a rock for 50 years, it would have made the news. My theory is, they simply returned to the same location 50 years later, and recreated the original photo.