Systemic weed-killer, like those made with glyphosate, should be applied directly to the weed you want to get rid of. Do not apply these products to your entire lawn. Glyphosate products kill all vegetation and should only be applied directly to the leaves of the dandelion.
That's one giant leap! Alan Eustace, a senior vice president at Google, set a new world record today by completing the highest-altitude skydive yet--parachuting from 135,908 feet (or 25 miles) above Earth. The record was previously held by daredevil skydiver Felix Baumgartner, who leaped from 24 miles above Earth in October 2012.
Neither of these designs goes very far off the ground, and arguably the most exciting invention of all is the Omni Hoverboard, which broke the Guinness World Record for longest distance travelled by a hoverboard in May 2015 when it flew a distance of 905ft at a height of 16ft in the air, in just 1.5 minutes.