Excessive salivation or hypersalivation may be the result of other problems such as infection, oral mucosal affection, or poisoning, but it may also not result from a previous condition but be a consequence of stress or anxiety.
Salivation in the teething period, on the other hand, is a completely natural occurrence in the months after birth; it is also common with advancing age in the senescence period due to tooth loss and gum recession.

Next-generation pacemakers may be powered by an unlikely source: the heart
Researchers are studying and developing new technologies to make new battery-free pacemakers. The innovation is based on a piezoelectric system that converts vibrational energy–created within the chest by each heartbeat–into