If you do decide to descend to the dark depths of Britain's man-made underworld, keep one eye out for "knockers" - mythical "little people" who were believed to live underground, leading miners towards rich seams of minerals.
The tiny country is blessed with some of the most fertile soil in Africa, but few rich deposits of minerals and very little manufacturing and industry.
Another factor was the quest to control Congo's unusually rich endowment of minerals and farmland, especially here in North Kivu Province.
Unlike many of Africa's frothiest economies, Kenya does not have a rich bounty of minerals or oil to export.
Since 1996, Congo has lurched from one crisis to the next, with neighboring nations and various armed groups fighting over the country's rich trove of minerals.
The little country next door invaded Congo twice, in 1996 and 1998, ostensibly to secure its own borders, though human rights groups have accused Rwandan troops of plundering Congo's rich trove of minerals and massacring civilians.
But, while centuries of struggle to end colonial rule and apartheid have not changed this much, now western influence is being challenged by China, which likewise covets Africa's rich reserves of minerals and resources.
Government delegations have toured Australia and Canada, armed with geological surveys, aiming to convince the world's leading mining communities that Greenland is a rich source of minerals – potentially the 21st century's new frontier.
Another cause for suspicion is Rwanda's past plundering of Congo's rich trove of minerals, going back to the late 1990s when the Rwandan Army seized control of eastern Congo and pumped hundreds of millions of dollars of smuggled coltan, cassiterite and even diamonds back to Rwanda, according to United Nations documents.
The tender leaf tips and leaves of bitter melon are a rich source of minerals, vitamin C, folic acid and vitamin A (Zhang et al. [2009]; Lim [2012]).
Fruits are a rich source of minerals and sugars, along with vitamin C and certain phenolic compounds which act as natural antioxidants (Zaouaya et al. 2012).
