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...Work is held at a negative potential of 400–800 V with respect to the chamber. Operating temperatures up to 1050°C, but usually below 950°C. Carbon source is hydrocarbon gas (methane or propane), often diluted with nitrogen, hydrogen and argon, which is bled into the vacuum chamber at a few litres per minute. Very little exhaust gas results, hence no risk of...

...working in the same office. The numbers of children each of us has are 0, 2, 4 and 2. The mean number of children per person is the number we’d each have if they were divided out evenly between the four of us. In total there are 8 children, so the mean number is 8 divided by 4 - which is, of course, 2. What happens if a new colleague joins us, and the new colleague has...

...work, and that’s where the second type of gravitational lensing observations came in. The authors repeatedly took images with Hubble for six years, measuring how far the star appeared to move as its light was deflected. Eventually this let them calculate the mass and distance of the object which caused the lensing effect. They found it was about seven times the mass of...

...works from the Hebrew Bible including copies of Genesis, Exodus, Isaiah, Kings and Deuteronomy as well as calendars, hymns, psalms and more. These are now known as the Dead Sea Scrolls. Try our free course on religion. 5. Process designed to help alcohol industry saves lives [red wine glass and bottle] You'd think it was an April Fool's Day prank if someone told you...