ON THIS DAY- German physicist Wilhelm Conrad Rontgenbecame the first person to observe X-rays on this day in 1895. Donald Trump was elected US President on this day last year and voters in Ireland elected Mary Robinson as its first woman president. In 1656, English astronomer and mathematician Edmond Halley, the first to calculate the orbit of Halley's Comet, was born. Oil and gas producers in Egypt were rushing to finalize agreements signed with the government this time two years ago. This time last year, Saudi Aramco cut us off, saying it is halting fuel shipments to Egypt until further notice.