An epilator is a motorised hair plucker. To pluck, the plucker passes a card face-down to the . Other variations include chicken queen and chicken plucker. His father was a coconut plucker and mother was a coir maker. Plucker is licensed under the GNU General Public License and is free software. Dr. Plucker has received a number of honors for his work. Early cold-cathode devices included the Geissler tube and Plucker tube, and early cathode ray tubes. Prof. Plucker has also led the development of a popular web site on human intelligence.