According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could (1) ordinary rock into smooth, gleaming iron. (2) this new technology, he taught his people to make hard, durable weapons for defeating their enemies and sharp axes for cutting the forest to make fields. By the time the first Europeans arrived in the 19th century, iron had become (3) in the kingdom of Rwanda.
Other traditional African societies tell stories of (4) ironworkers who descended from heaven or came from other lands. The prevalence of such legends (5) the importance of ironworking in these cultures, and archaeologists have long wondered if the arrival of iron metallurgy (6) the growth of complex early societies. Did foreigners (7) bring ironworking to Africa, or did Africans invent it themselves
Entering the Iron Age was not easy. Metalworkers had to melt ore at (8) temperatures and then repeatedly hammer and reheat the spongy metal. The traditional view is that metallurgists in Turkey were the first to melt iron ore (9) , beginning around 1800 B.C.E. Initially, they (10) the new metal for precious (11) or ritual objects. But by 1200 B.C.E., workers in the Levant were boiling out (12) amounts of iron.
The metal had a major (13) on societies. Iron was a transformative metal. Iron ores are much more (14) than copper or the tin needed to make bronze. Bronze was (15) costly and largely limited (16) use in ritual objects and goods for (17) . But once cultures learned to melt iron, they could put iron tools into the hands of (18) people for clearing forests and tilling the (19) . This boosted agricultural yields, increased the numbers of villages, and (20) ever more social complexity.

Benjamin Franklin just got a face-lift. And it’s about time. Over the past seven years, the Treasury Department has redesigned the ＄5, ＄10, ＄20 and ＄50 bills, citing counterfeiting (1) On April 21, the ＄100 bill (2) its fellows when the U.S. Bureau of Engraving and Printing (BEP) unveiled its latest bill. The ＄100 bill is the highest-denomination note in (3) and can weather more than seven years of (4) A humble ＄1 bill lasts only 21 months.
The American Revolution’s continental currency-the first attempt (5) national tender-did not have the same kind of (6) . So much of the money was produced to (7) the war that it quickly (8) . In 1863, Congress (9) the issuance of paper tender, much of which was easy to counterfeit. It is estimated that one-third of money circulating at the time was (10) . But that didn’t stop the government from producing (11) of it. By the time the BEP was officially established in 1874, the Treasury Department had been creating (12) for more than a decade-with dozens of clerks manually cutting and signing bills before the process was (13)
The U.S. started producing coins in 1792. The first piece of money to feature a President’s (14) was a coin: the Abraham Lincoln penny, created in 1909. And (15) the fact that it costs to make each coin, more pennies are produced than any other U.S. denomination. (16) bills such as the ＄500, ＄1,000, ＄5,000, and ＄10,000 had no such luck, (17) , and the ＄100,000 note was printed but never released . (18) hundreds of billions of dollars in circulation at any given time (more than ＄330 billion was produced last year alone), updating security features on currency is a (n) (19) process. "In God We (20) ," sure. In humans, not so much.

According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could (1) ordinary rock into smooth, gleaming iron. (2) this new technology, he taught his people to make hard, durable weapons for defeating their enemies and sharp axes for cutting the forest to make fields. By the time the first Europeans arrived in the 19th century, iron had become (3) in the kingdom of Rwanda.
Other traditional African societies tell stories of (4) ironworkers who descended from heaven or came from other lands. The prevalence of such legends (5) the importance of ironworking in these cultures, and archaeologists have long wondered if the arrival of iron metallurgy (6) the growth of complex early societies. Did foreigners (7) bring ironworking to Africa, or did Africans invent it themselves
Entering the Iron Age was not easy. Metalworkers had to melt ore at (8) temperatures and then repeatedly hammer and reheat the spongy metal. The traditional view is that metallurgists in Turkey were the first to melt iron ore (9) , beginning around 1800 B.C.E. Initially, they (10) the new metal for precious (11) or ritual objects. But by 1200 B.C.E., workers in the Levant were boiling out (12) amounts of iron.
The metal had a major (13) on societies. Iron was a transformative metal. Iron ores are much more (14) than copper or the tin needed to make bronze. Bronze was (15) costly and largely limited (16) use in ritual objects and goods for (17) . But once cultures learned to melt iron, they could put iron tools into the hands of (18) people for clearing forests and tilling the (19) . This boosted agricultural yields, increased the numbers of villages, and (20) ever more social complexity.

Benjamin Franklin just got a face-lift. And it’s about time. Over the past seven years, the Treasury Department has redesigned the ＄5, ＄10, ＄20 and ＄50 bills, citing counterfeiting (1) On April 21, the ＄100 bill (2) its fellows when the U.S. Bureau of Engraving and Printing (BEP) unveiled its latest bill. The ＄100 bill is the highest-denomination note in (3) and can weather more than seven years of (4) A humble ＄1 bill lasts only 21 months.
The American Revolution’s continental currency-the first attempt (5) national tender-did not have the same kind of (6) . So much of the money was produced to (7) the war that it quickly (8) . In 1863, Congress (9) the issuance of paper tender, much of which was easy to counterfeit. It is estimated that one-third of money circulating at the time was (10) . But that didn’t stop the government from producing (11) of it. By the time the BEP was officially established in 1874, the Treasury Department had been creating (12) for more than a decade-with dozens of clerks manually cutting and signing bills before the process was (13)
The U.S. started producing coins in 1792. The first piece of money to feature a President’s (14) was a coin: the Abraham Lincoln penny, created in 1909. And (15) the fact that it costs to make each coin, more pennies are produced than any other U.S. denomination. (16) bills such as the ＄500, ＄1,000, ＄5,000, and ＄10,000 had no such luck, (17) , and the ＄100,000 note was printed but never released . (18) hundreds of billions of dollars in circulation at any given time (more than ＄330 billion was produced last year alone), updating security features on currency is a (n) (19) process. "In God We (20) ," sure. In humans, not so much.

According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could (1) ordinary rock into smooth, gleaming iron. (2) this new technology, he taught his people to make hard, durable weapons for defeating their enemies and sharp axes for cutting the forest to make fields. By the time the first Europeans arrived in the 19th century, iron had become (3) in the kingdom of Rwanda.
Other traditional African societies tell stories of (4) ironworkers who descended from heaven or came from other lands. The prevalence of such legends (5) the importance of ironworking in these cultures, and archaeologists have long wondered if the arrival of iron metallurgy (6) the growth of complex early societies. Did foreigners (7) bring ironworking to Africa, or did Africans invent it themselves
Entering the Iron Age was not easy. Metalworkers had to melt ore at (8) temperatures and then repeatedly hammer and reheat the spongy metal. The traditional view is that metallurgists in Turkey were the first to melt iron ore (9) , beginning around 1800 B.C.E. Initially, they (10) the new metal for precious (11) or ritual objects. But by 1200 B.C.E., workers in the Levant were boiling out (12) amounts of iron.
The metal had a major (13) on societies. Iron was a transformative metal. Iron ores are much more (14) than copper or the tin needed to make bronze. Bronze was (15) costly and largely limited (16) use in ritual objects and goods for (17) . But once cultures learned to melt iron, they could put iron tools into the hands of (18) people for clearing forests and tilling the (19) . This boosted agricultural yields, increased the numbers of villages, and (20) ever more social complexity.

Benjamin Franklin just got a face-lift. And it’s about time. Over the past seven years, the Treasury Department has redesigned the ＄5, ＄10, ＄20 and ＄50 bills, citing counterfeiting (1) On April 21, the ＄100 bill (2) its fellows when the U.S. Bureau of Engraving and Printing (BEP) unveiled its latest bill. The ＄100 bill is the highest-denomination note in (3) and can weather more than seven years of (4) A humble ＄1 bill lasts only 21 months.
The American Revolution’s continental currency-the first attempt (5) national tender-did not have the same kind of (6) . So much of the money was produced to (7) the war that it quickly (8) . In 1863, Congress (9) the issuance of paper tender, much of which was easy to counterfeit. It is estimated that one-third of money circulating at the time was (10) . But that didn’t stop the government from producing (11) of it. By the time the BEP was officially established in 1874, the Treasury Department had been creating (12) for more than a decade-with dozens of clerks manually cutting and signing bills before the process was (13)
The U.S. started producing coins in 1792. The first piece of money to feature a President’s (14) was a coin: the Abraham Lincoln penny, created in 1909. And (15) the fact that it costs to make each coin, more pennies are produced than any other U.S. denomination. (16) bills such as the ＄500, ＄1,000, ＄5,000, and ＄10,000 had no such luck, (17) , and the ＄100,000 note was printed but never released . (18) hundreds of billions of dollars in circulation at any given time (more than ＄330 billion was produced last year alone), updating security features on currency is a (n) (19) process. "In God We (20) ," sure. In humans, not so much.