1.   In fusion reactions, light atoms are brought together sufficiently energetically to overcome their natural repulsion.

2.   The spark was supposed to ignite the fusion reaction or miniature thermonuclear explosion.

3.   An unrestrained, cascading fusion reaction produces the annihilative power of the hydrogen bomb.

4.   Besides compressing and igniting fusion fuel magnetically, the fusion reactions could also be ignited by an implosion as in hydrogen bombs.

5.   Billions of them, produced by fusion reactions within the Sun, fly through every person every second.

6.   But finding a way to use an on-going, self-sustaining nuclear fusion reaction for a controllable energy source has engineers stumped.

7.   But he thinks the best reason to celebrate is that fusion reactions can now be studied without expensive equipment.

8.   Fusion reactions are incredibly potent and produce almost no pollution.

9.   Having run out of fuel for the nuclear fusion reactions in its core, it succumbed to its own gravity and collapsed.

10.   Its goal is to ignite a self-sustaining fusion reaction in a controlled laboratory setting.