Nubian giraffes are seen in Murchison Falls, Uganda in this undated handout picture. To match SCIENCE-GIRAFFE/ Courtesy Julian Fennessy/Handout via REUTERS

An Angolan giraffe herd is seen in Damaraland, Namibia in this undated handout picture. To match SCIENCE-GIRAFFE/ Courtesy Julian Fennessy/Handout via REUTERS

Republican presidential nominee Donald Trump reads off a teleprompter as he speaks at the Cleveland Arts and Social Sciences Academy in Cleveland, Ohio, U.S., September 8, 2016. REUTERS/Mike Segar

A Dell logo is pictured on the side of a computer in this photo illustration in the Manhattan borough of New York October 12, 2015. REUTERS/Carlo Allegri

Research associate Karen Lee of Agency for Science Technology and Research's (A*STAR) Experimental Therapeutics Centre prepares a reaction mix to be tested with the Zika virus diagnostic test kit at their laboratory in Singapore, February 10, 2016. REUTERS/Edgar Su/File Photo

QINHUANGDAO, CHINA - SEPTEMBER 07: Tracks for Transit Elevated Bus (TEB) are pictured on September 7, 2016 in Qinhuangdao, Hebei Province of China. Medias reported in April that the Qinhuangdao Municipal Government has signed strategic agreement with TEB Technology Development Co.,Ltd to restore the road after the TEB 1 testing successfully until the deadline on August 31. While the reporters witnessed on September 7 that the TEB 1 seems to be still testing. (Photo by VCG/VCG via Getty Images)

(FILES) This file photo taken on January 17, 1983 shows Argentine writer Jose Luis Borges arriving at the Political and Moral Sciences Academy in Paris for a reception. During a conference on September 7, 2016 at the Casa de America in Madrid, Argentinian Marcos Ricardo Barnatan, biographer,friend and countryman of Jorge Luis Borges, explained the impact of the Jewish Kabbala on Borges' stories like "The Zahir", "The writing of the god" or "Death and the compass". / AFP PHOTO / STRSTR/AFP/Getty Images

LAS VEGAS, NV - SEPTEMBER 07: The Intel Aero Compute Board that powers the Intel Aero Ready To Fly drone is displayed at InterDrone, an international drone conference and exposition for commercial drones, at the Paris Las Vegas on September 7, 2016 in Las Vegas, Nevada. The unmanned aerial vehicle development platform is geared towards software developers and researchers to get applications airborne quickly. The conference runs through September 9 and is expected to feature 160 exhibitors showing off their latest products and services to more than 4,000 attendees. The Federal Aviation Administration's Part 107 regulations to operate small unmanned aircraft systems (sUAS) or drones, went into effect in August allowing operators of commercial drones weighing more than .55 pounds and less than 55 pounds to obtain a remote pilot certificate after passing a FAA knowledge exam. (Photo by Ethan Miller/Getty Images)