More information, please

Japan firm claims world’s largest gold bullion bar

Japan’s Mitsubishi Materials Corp. says it has produced the world’s biggest gold bullion bar, a 250-kg block worth about $3.44 billion at current prices.

How? Through alchemy? I mean, did they artificially create gold in a laboratory, or is it just extremely difficult to get existing gold to form into a bar?

Yes, I really am this ignorant!