Around 1000 AD, which people reached North America and named parts of it Helluland, Markland and Vinland?

What is someone who speaks both Spanish and English, for example, called? About one hydrogen atom in 6,500 is which heavier isotope? About 1 male in 10,000 is born with which bleeding disorder, in which the blood lacks clotting factor VIII? About 10 percent of your body mass is which simplest element? About 1,000 times as many people attended which leader's 1970 Cairo funeral as attended his successor's? About 10,000 years ago, what dug out many of Minnesota's "10,000 lakes"? About 100,000 people greeted which aviator at Le Bourget airfield when he landed there in 1927? Which sea, about 1,200 miles long, has a maximum depth of almost 10,000 feet?