The most well-known use of lithium is probably the lithium-ion batteries in smart phones and laptop computers.
Lithium is widely used in glass and ceramics. For example, lithium oxide can improve the glaze of ovenware.
Bringing lithium compounds over a flame turns the flame colour into a beautiful red.
Lithium is the least dense of all metals, and it can float on most oils.
Lithium salts can be used as a psychiatric medication, stabilizing anxiety and depression.