Later Monday, an explosion was heard in Belgrade after nightfall, and anti-aircraft fire lit up the skies.

CNN: Yugoslav train hit during NATO strike; 10 dead

She added that the authorities, who called off the search after nightfall, were expected to resume it in the morning.

BBC: Missoni boss missing as Venezuela plane disappears

The faded glories of Old Havana are best appreciated on foot, but to fully explore the city, and after nightfall in some of the sketchier areas, you're better off taking a taxi.

CNN: An insider's guide to Havana

Here, under the date palms, where the sun shines more than 300 days a year and the scent of coconut oil drifts from the beach, joggers, cyclists, dog walkers and rollerbladers pass by in a constant parade that ends only after nightfall.

BBC: The perfect trip: Provence and the C?te d��Azur

Without the discovery of and ability to produce fossil fuels, it is likely that mankind would still be mired in a Medieval form of existence, reliant on burning wood for heat, horses for transportation, and still living largely in the dark after nightfall.

FORBES: Thank Mother Earth for Oil, Natural Gas and Other Fossil Fuels