Actively motile, flagellated phytoplankton taxa often exploit vertical gradients in the availability of light and nutrients. The ability to move actively usually goes along with low investment in ...

Merriam-Webster changed "immunity" to "immune response" in its definition of "vaccine" to be more scientifically accurate, the dictionary said.

Harvard University has agreed to strengthen its policies against antisemitism on campus as part of a settlement of two federal lawsuits accusing the school of not doing enough to prevent ...

The CDC changed its definition for “vaccine” and “vaccination” to be more transparent about how shots offer protection not immunity for all diseases.

The United Kingdom’s highest court ruled that the legal definition of “woman” excludes trans women, in a case with sweeping consequences for how equality laws are applied.

Trump's definition of 'male,' 'female' criticized by medical and legal experts President Trump issued an executive order limiting gender definitions on Monday.

The Supreme Court has ruled that the legal definition of a woman is based on biological sex, in a decision which could have far-reaching implications for who can access single-sex services and spaces.

A new definition of the kilogram, the unit of mass in the International System of Units, went into effect today, World Metrology Day.

However, the new proposed rule change would rescind the regulatory definition of “harm,” limiting the Act’s prohibitions to actions that directly injure or kill listed species. What you can do: All ...