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.
You can make a usb like pendrive bootable so that we can boot from pendrive. USBBootmaker a software, can be used to make bootable pendrive. Use: -Can use to install Os from usb like windows ,Linux... -Can use USB as live Os. -For Troubleshooting. Etc. Usually systems boot from Harddisk or Bootable CD etc.