Osteoporosis is a disease in which the bone density decreases, causing bones to be weak and more prone to fracture.

This moving arm depicts skeletal muscle, or voluntary muscles, which move when we want them to move. Skeletal muscles usually work in pairs, meaning that when one contracts the other relaxes.

A torn muscle occurs when muscle is torn apart or away from the bone.

Nuclear fission is the process by which atoms are split and energy is released.

Henry dreams of a world where his life belongs to him. But when his family is sold, he risks everything for what he knows is right. With the strength and conviction of the best kind of hero, Henry makes a harrowing journey in a wooden crate -- and mails himself to freedom!

In the next installment of our Learn @ Home series, Jared and Dani connect with Hilary Linton, a 5th grade teacher at Oakwood Elementary, to discuss the impact of moving to an online curriculum. Hilary shares her insights on the importance of letting students know they are cared for, working with your team to be successful and how to juggle working from home with helping you own family cope with everything going on.

This original, eight-part series Downloadable docss Black Achievement in American history, its defining role in the growth of the country, and its influence on current events. The series highlights the many contributions of Black Americans that have influenced our culture, enriched our society with their achievements, and shaped the history of the United States. In this program, the following events are explained: 1619 - 1621 - Blacks Arrive at Jamestown, 1705 - The Virginia General Assembly Passes the Slave Codes, 1762 - Entrepreneur Samuel Fraunces Opens New York City's Most Cherished Revolutionary War Site: The Fraunces Tavern and 1770 - Crispus Attucks and the Black Patriots.

This original, eight-part series Downloadable docss Black Achievement in American history, its defining role in the growth of the country, and its influence on current events. The series highlights the many contributions of Black Americans that have influenced our culture, enriched our society with their achievements, and shaped the history of the United States. In this program, the following events are explained: 1772 - Chicago is Settled by Jean DuSable, 1776 - Lemuel Haynes Helps Lay the Foundation for Abolition, 1791 - The First Black Man of Science, Benjamin Banneker, Surveys Washington, D.C., 1821 - African Grove Theatre Founded in New York, 1822 - Denmark Vesey and the Slave Revolts, 1823 - Legendary Mountain Man James Beckwourth Enters the Rockies and 1849 - Harriet Tubman Uses Underground Railroad to Become Free.

This original, eight-part series Downloadable docss Black Achievement in American history, its defining role in the growth of the country, and its influence on current events. The series highlights the many contributions of Black Americans that have influenced our culture, enriched our society with their achievements, and shaped the history of the United States. In this program, the following events are explained: 1851 - Sojourner Truth Delivers Famous Ain't I a Woman Speech, 1854 - First Black University Founded: Lincoln University, 1855 - Frederick Douglass Publishes My Bondage and My Freedom, 1857 - Dred Scott Decision Helps Trigger the Civil War, 1863 - Lincoln Signs Emancipation Proclamation, 1863 - Black Regiment Storms Fort Wagner in the Civil War and 1865 - 1869 - 13th, 14th and 15th Amendments Establish Civil Rights for All.

This original, eight-part series Downloadable docss Black Achievement in American history, its defining role in the growth of the country, and its influence on current events. The series highlights the many contributions of Black Americans that have influenced our culture, enriched our society with their achievements, and shaped the history of the United States. In this program, the following events are explained: 1875 - Robert Smalls, Former Slave, Elected to House, 1878 - The Black Cowboy and George McJunkin, 1881 - Booker T. Washington Opens Tuskegee Institute, 1884 - T. Thomas Fortune Prophesises the Long and Bitter Struggle for Equality, 1887 - Granville T. Woods, Called the "Black Edison", Patents the Induction Telegraph System, 1893 - Ida B. Wells-Barnett Crusades Against Black Lynching in America and 1896 - Plessy v. Ferguson Case Upholds Segregation.

This original, eight-part series Downloadable docss Black Achievement in American history, its defining role in the growth of the country, and its influence on current events. The series highlights the many contributions of Black Americans that have influenced our culture, enriched our society with their achievements, and shaped the history of the United States. In this program, the following events are explained: 1904 - Scott Joplin and Ma Rainey Initiate the Merger of Two Cultures, 1909 - Matthew Henson Discovers the North Pole, 1909 - W.E.B. DuBois Founds the NAACP, 1924 - George Washington Carver Renaissance Man, 1925 - Alain Locke Leads Harlem Renaissance and 1926 - Satchel Paige Stars in the National Negro Baseball League.

This original, eight-part series Downloadable docss Black Achievement in American history, its defining role in the growth of the country, and its influence on current events. The series highlights the many contributions of Black Americans that have influenced our culture, enriched our society with their achievements, and shaped the history of the United States. In this program, the following events are explained: 1935 - Mary McLeod Bethune: American Woman of the 20th Century, 1936 - 1938 - Jesse Owens And Joe Louis Debunk Hitler's Claim of Aryan Superiority, 1939 - Hattie McDaniel Wins the Oscar, 1940 - First Black General, Benjamin O. Davis Sr., is Stepping Stone to Desegregation of U.S. Army and 1943 - Duke Ellington's Band Performs Black, Brown and Beige at Carnegie Hall.

This original, eight-part series Downloadable docss Black Achievement in American history, its defining role in the growth of the country, and its influence on current events. The series highlights the many contributions of Black Americans that have influenced our culture, enriched our society with their achievements, and shaped the history of the United States. In this program, the following events are explained: 1950 - Ralph Bunche Wins the Nobel Peace Prize
1950 - Gwendolyn Brooks Becomes the First Black Recipient of the Pulitzer Prize, 1954 - Brown v. Board of Education of Topeka, Kansas, 1955 - Rosa Parks Refuses to Give Up Her Seat to a White Passenger on a Montgomery Bus, 1956 - Althea Gibson, First Black Woman To Win a Tennis Grand Slam Event, 1959 - Lorraine Hansberry's Play A Raisin in the Sun is Produced and 1963 - Martin Luther King Jr. Delivers his "I Have a Dream" Speech.

This original, eight-part series Downloadable docss Black Achievement in American history, its defining role in the growth of the country, and its influence on current events. The series highlights the many contributions of Black Americans that have influenced our culture, enriched our society with their achievements, and shaped the history of the United States. In this program, the following events are explained: 1967 - Muhammad Ali Refuses Induction into the U.S. Army on Religious Grounds, 1967 - Thurgood Marshall, First Black U.S. Supreme Court Justice, 1977 - Alex Haley's Roots: The Saga of an American FamilyAppears on TV, 2001 - Colin Powell Appointed Secretary of State and 2004 - Neil deGrasse Tyson Becomes Astrophysics' Superstar.

Join host Archie Kao as he shares the incredible story of Chinese American Achievement, from the first wave of immigrants in California's gold fields to the entrepreneurs of the 21st century's Information Age. In this episode, the following events are discussed: 1854 - Yung Wing Becomes the First Chinese American to Graduate from a U.S. College, 1854 - Chinese Six Companies Represent All Chinese in the United States, 1862 - Chinese Americans Distinguish Themselves in the American Civil War, 1865 - Chinese American Laborers Build the Transcontinental Railroad, 1882 - Congress Passes the Chinese Exclusion Act and 1884 - Joseph and Mary Tape Successfully Challenge San Francisco Public Schools.

Join host Archie Kao as he shares the incredible story of Chinese American Achievement, from the first wave of immigrants in California's gold fields to the entrepreneurs of the 21st century's Information Age. In this episode, the following events are discussed: 1886 - San Francisco's Chinese American Laundry Men Sue for Equal Rights, 1887 - Doc Hay and Lung On Arrive on the Eastern Oregon Frontier, 1888 - Lue Gim Gong, Father of the Florida Citrus Industry, 1894 - Polly Bemis, an Angel in Idaho's Wilderness and 1906 - San Francisco Earthquake's Impacts on the Chinese American Community.