1.   A hydrogen leak forced NASA to ground the space shuttle.

2.   The decision followed a hydrogen leak from the fuel system of the Atlantis shuttle, due for launch in mid-July with a secret military payload.

3.   The hydrogen fuel leak is similar to one which grounded Columbia a few months ago.

4.   An entry by Virginia Tech developed hydrogen leaks and other problems.

5.   Then Sunday, the space agency disclosed photographic evidence of a small hydrogen leak from the nozzle of the right rocket engine.

6.   A nuclear reactor at a Ukrainian power plant was shut down following a hydrogen leak Saturday, officials said.

7.   Company officials said the Taoyuan accident may have been caused by a hydrogen leak from a jet fuel compressor.

8.   On Sunday, a hydrogen leak in the same cooling system forced staff to switch off the reactor for two days.

9.   Shein refused to comment on possible hydrogen leaks.

10.   The laboratory-research mission is already eight days late getting started because of the hurricane and a dangerous hydrogen fuel leak.