The legal marijuana industry is set to surpass $20 billion globally by 2020. At the heart of this 'green boom' are the strain hunters who search the far corners of the Earth to find the never before mixed strains of marijuana known as 'landraces'. VICE correspondent Hamilton Morris joins two hunters on an epic journey through the Democratic Republic of Congo, as they search for one of the rarest species of Cannabis yet whose unique genetics could ultimately earn them millions of dollars. If you gathered up every physical thing we can see in Outer Space -- our Earth, all the planets, all the stars - it would account for a mere 5% of the Universe's total mass. The rest, that other 95%, is known only as "Dark Matter" and "Dark Energy." Understanding these two forces is the biggest mystery in modern physics. From an abandoned gold mine that lies a mile beneath the Black Hills of South Dakota, to the world's most powerful telescope nestled into the high deserts of Chile, nuclear physicist ...