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.
# Connect to Virtual PC $vpc = new-object -com VirtualPC.Application # Get VM name $vmName = Read-host Specify the name of the virtual machine that you want to use # List available USB devices write-host The following USB devices are available: $vpc.USBDeviceCollection | select -ExpandProperty DeviceString # Get the USB device name $usb = ...