Planet Earth Could Be Aliens' Zoo: Living Creatures Out There Might Be Avoiding Humans

With the numerous theories that exist trying to explain extra-terrestrial life, one of the theories that have been thought of decades ago is now being revisited by experts. Exploring the said concept, some physicist and experts now stand behind the idea that probably, it's hard for us humans to track and locate aliens because they are intelligent enough to be "unseen," making planet Earth and all its living things as their observatory and "sanctuary" that is closely being monitored.