For former game developer Chad Jessup, it's probably the beta version of the original Half-Life he uncovered this month, now ...

Until this week, the latest news on Half-Life 3 was that Valve had canceled ... that insiders have apparently informed him of ongoing beta testing for what he refers to as "HLX," which is thought ...

After emitting an alpha or beta particle, the nucleus will often still be ‘excited’ and will need to lose energy. It does this by emitting a high energy electromagnetic wave called a gamma ray.

Look at this point on the graph in relation to the y-axis. You will see that the counts per minute have halved in two days. This means that it has a half-life of two days.