Should I or shouldn’t I? After more than two years of living with the coronavirus pandemic, the handshake is more or less back, even though many had declared it dead. Touching elbows and bumping fists have failed to become the norm. The handshaking ritual is too deep-seated – when the palms of the hands interlock, the fingers touch and the eyes meet. “We depend on physical contact with others,” says psychologist Martin Grunwald, who heads a research laboratory at the University of Leipzig. “Only through so-called full-contact information do we assure ourselves that the other person really exis…