Understanding and tracking time is key to keeping society -- and our lives -- running smoothly. Early civilizations developed calendars with just 300 days in a year. But by 1582, the time it takes for Earth to rotate around the sun was better understood, and Pope Gregory introduced the 365-day Gregorian calendar -- the one used by most of the world today. Listen to hear a scientist explain the math behind adding and subtracting leap days to keep the calendar aligned with the Earth’s movement, and learn how Christianity played a role in the calendar’s creation.
Story Length: 5:24
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This public radio story describes the Julian calendar, developed during the rule of Julius Caesar in Rome in the first century BCE, and how this calendar failed to keep accurate time for the Catholic Church centuries later. You will hear how Pope Gregory called on modern science to create an accurate calendar in the 1500s, and that became the calendar we use today.
Early humans traded goods to get what they needed, but bartering was not practical when one person did not want or need what the other had to offer. Eventually money was invented to make economic exchanges easier and more practical. Listen to hear how our money system evolved, what early currencies looked like, and why people must agree on the worth of currency for it to have value.
Chocolate is not just a delicious treat, but a relic of the ancient Mesoamerican civilizations where it was first developed. Early indigenous groups ground dried cacao beans into powder to mix with water. Some believed chocolate was a gift from the gods and incorporated it into religious ceremonies. Spanish explorers brought the delicacy to Europe, where food enthusiasts created the first chocolate bars. Listen to learn more about the history of chocolate and why one ancient leader is said to have drunk a gallon of chocolate each day.
The Lexile Audio Measure is an indicator of the complexity of an audio passage. It is based on a scientifically developed scale with a maximum score of 2000L.How to Use Lexile Audio Measures
Find stories at the right level of complexity for your students, so that they will be challenged without being frustrated. The measures are categorized into low, medium, or high in order to aid teachers in story selection when they do not know students’ Lexile listening levels.
|Listening Level||Lexile Audio Measures|
These recommended ranges are for instructional use of Listenwise audio content in combination with supports such as the interactive transcript, etc.
|Grade||Lexile Audio Measures (Recommended Ranges)|
|1||215L - 610L|
|2||490L - 855L|
|3||725L - 1060L|
|4||945L - 1250L|
|5||1045L - 1350L|
|6||1125L - 1430L|
|7||1190L - 1500L|
|8||1250L - 1555L|
|9||1300L - 1610L|
|10||1345L - 1655L|
|11/12||1385L - 1695L|