feb 1, 1998 - 1998
February 24 - France's National Assembly votes unanimously to ratify the CTBT.
May 11 - India conducts three underground nuclear tests, its first in 24 years. One of the tests is a thermonuclear weapon.
May 13 - India conducts two more nuclear tests.
May 28 - Pakistan conducts five nuclear tests in response to India's nuclear tests.
May 30 - Pakistan conducts its sixth nuclear weapons test. The explosion is in the 1 to 5 kiloton range.
Added to timeline:
atomic and nuclear physics