1.   Blue stars contain more hydrogen than smaller stars, but burn hotter and burn out more quickly.

2.   The hydrogen that drives these small marvels will probably be provided by methanol, a compound commonly known as wood alcohol that contains hydrogen, Dyer said.

3.   They directed the beams at targets containing liquid hydrogen.

4.   Thus, when Mars Odyssey passes over a region containing hydrogen, it sees more slow neutrons and fewer of the faster ones.

5.   The automakers are working on fuel-cell cars that run on different types of fuel besides pure hydrogen, such as methanol, a liquid that contains hydrogen.