1
Far more helium has been withdrawn from the reserve, earlier, than policymakers intended.
2
Like I said before, though, I'll need to find more helium.
3
Much more helium than necessary was being produced, and the bleeder valve had failed.
4
We can't get any more helium here; in fact, not until we get back to Panama.
5
There would be no more helium production now.
6
These would convert the hydrogen into more helium.
7
Fusion energy production continued within a small envelope of hydrogen wrapped around the central region, yielding more helium which slowly sank inward.