While vaccine hesitancy remains an ongoing public health issue, claims have begun circulating on social media that the COVID-19 vaccine contains living creatures called hydras – small, tentacled, ...

European green crabs are a significant invasive species An effort to eradicate them was initially a success A year later, their number had a 30-fold increase Hydra effect is to blame, scientists said ...

Hydra species, freshwater cnidarians, are one of the few groups of animals with no defined aging. The longest studies to date (~8 years) observed no increase in mortality rate, or decrease in ...