features of Ytterbium:

• ytterbium staff (craft like a big stick of ytterbium). it applies the radiation effect and has a range of 6. ytterbium is a source of gamma rays
• ytterbium ore naturally generates, drops ytterbium
• radiation effect, sets baby's on fire, adults glow and damages any mob or player that has it. you can get it by being hit with gamma rays (from the ytterbium staff)
• ytterbium powder can be composted, used as furnace fuel and ignites when dropped. crafted with ytterbium
• an analog clock block that cycle redstone output from 0 to 15 increasing every tick
• a binary clock that toggles on/0ff every tick
• display, displaying the input signal strength in hex (needs better texture)