Each quarter of dough will make approximately twelve ravioli. From here on out, the steps will differ based on whether you're using a ravioli maker or working by hand (if you have a stamp, follow the by-hand directions as well).
Other than that, not much difference. I'd still recommend using Source when you want to play. HALF-LIFE: Source is the same game as the original HALF-LIFE but it's graphics and physic engine is improved with the Source engine that is used in the HALF-LIFE 2. It is an improved version with better quality. If you want a Source experience choose it, but if you want to remember the old days, buy the original game.
In a medical context, half-life may also describe the time it takes for the blood plasma concentration of a substance to halve (plasma half-life) its steady-state. There's obviously a correlation between the half-life of a drug & the duration of it's effects. The longer the half-life, the longer the effect.