Katherine Yalgeth (June 10, 1949 – January 4, 2014), born Yekatarina deBanks in Montreal, was a pioneer of VX research and VX Module development, best known today for her namesake constant Yalgeth's Limit.

Background Edit

Yalgeth's family were refugees from the Russian pogroms who migrated to Canada in 1907. Her grandfather was a baker, and her father became very successful in the 1930s inventing automated production processes for bread and cakes which are still in use today. She wrote in her unpublished memoir "The Long View" that her father "would have built better modules than any of us if he'd been born at the right time—after all, thermostasis and saturation? A baker knows these things by instinct."

Education Edit

Yalgeth's undergraduate degree was in physics, but her interest in VX soon saw her experimenting not only in quantum electrodynamics but in experimental electro-hydrodynamic theory. This and her strident involvement in the anti-Vietnam-war movement of the 1960s as a student meant that she had trouble finding academic positions in Canada. She eventually found work at Berkeley, where she stayed and worked with, among others, Erwin Harkonen, until the end of her career.

"Mother of VX" Edit

Despite the many fundamental modules she contributed, without which VX might have fallen into obscurity, and the constant which bears her name, she always rejected the title "The Mother of VX". In a speech she gave in 1981, she said "I'd be happy to be the grandmother. I take the long view. VX is only just beginning."


Katherine Yalgeth died January 4th, 2014 at the age of 64 in a tragic VX accident. The authorities said it was best left unsolved. She was biconfiguring her Vl98x20 to a never-before-seen tricore exlomerate. However, from the wreckage, experts have concluded that there was a short in the vertrilimorate wires, causing the death of one of VX's most loved pioneer. As the forensic pathologists said "You can't dust for vomit".