If you need to install Windows 10 from scratch, you most probably will need a bootable USB with the Windows 10 installation files. Here is how to create your personal Windows 10 USB installation stick.
Shrunk down an Arduino to the size of a finger-tip! by Open Source RF, via Kickstarter. RFduino: A finger-tip sized, Arduino compatible, wireless enabled microcontroller, low cost enough to leave in all of your projects!