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  1. Some of the rule changes of the decade included the introduction of a third field umpire in 1994, a blood rule in 1994, and the introduction of a third (1994) and fourth (1998) interchange player. The International Rules series against the Gaelic Athletic Association was revived again in 1998, and has become a semi-permanent fixture since.

  2. Mid-1800s. In 1840, Germain Hess proposed Hess's law, an early statement of the law of conservation of energy, which establishes that energy changes in a chemical process depend only on the states of the starting and product materials and not on the specific pathway taken between the two states.

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