So some rocks are radioactive because they have radioisotopes in their nuclei. Also they may have radon gas trapped in their crystals if they are igneous rock. They could also be radioactive due to the fact that the atom of the rock is unstable.
Connecting USB Devices Manually. Choose VM > Removable Devices to connect specific USB devices to your virtual machine. You can connect up to two USB devices at a time. If the physical USB devices are connected to the host computer through a hub, the virtual machine sees only the USB devices, not the hub.
Before we install OS X, we'll need to set up VirtualBox so the OS X install disc can boot correctly. Here's what you need to do: 1  Start up VirtualBox and click the New button. 2  Give your new virtual machine a name (I just called it Mac OS X) and set the operating system to Mac OS X Server (64-bit).3  Click Next and choose how much RAM to give your virtual machine. After a moment, it'll take you to the OS X Installation screen. 2  Click on your VirtualBox hard drive in the left sidebar, then click the Erase tab in Disk Utility's main pane. 3  Give your drive a name (like Macintosh HD) and click Erase.