Since the early 1980s, HIV has infected more than 76 million people.

Two men killed 12 people and injured 11 at the Charlie Hebdo newspaper office in Paris in 2015.

Fidel Castro established a communist government in Cuba in 1959.

In 2015, scientists confirmed the existence of water on Mars.

Barack Obama became the first African American US president in 2009.

John Lennon was killed by a fan on December 8, 1980, in New York City's Central Park.

In 2003, scientists completed the Human Genome Project.

Events in Dec. 2010 led to the peaceful removal of Tunisia's prime minister in Jan. 2011.

In 2014, a new species of insect was found in Vietnam. It has a body over 30cm long and is the second longest insect in the world.

On June 12, 2016, a gunman entered a nightclub in Florida where he killed 49 people and injured more than 50

Advances in robot technology have come a long way in recent years. Scientists like Japan's Hiroshi Ishiguro have created human-like robots that can have conversations with each other and with humans.

Prime Minister Benazir Bhutto of Pakistan was killed after leaving a campaign rally in Dec. 2007.

In 2010, a series of floods in Australia affected over 200,000 people and caused nearly a billion AUS dollars in damage.

Jazz first became popular __ the 1920s.

The cell phone was invented about 45 years __.

Brasilia has been the capital city of Brazil __ 1960.

The first laptop was produced __ 1981.

Mexico has been independent __ more than 200 years.

World War II lasted __ 1939 __ 1945.

Vietnam was separated into two parts __ about 20 years.

East and West Germany have been united __ 1990.

My mom's birthday is __ February 13th.

Salma volunteers __ weekends.

Will and Jason go to camp __ the summer.

It rains a lot __ the winter.

My boss expects me to be at my desk __ 9:00 am every weekday morning.

We have class until midnight __ Ramadan.

WWII started __ September 1939 when Germany invaded Poland.

Tom Brady won his first Super Bowl __ 2002 with the New England Patriots, who defeated the St. Louis Rams.

According to paleontologists, T-Rex lived about 85 million to 65 million years __.

The vast majority of woolly mammoths have been extinct ___ the end of the last ice age, about 10,500 years ago.

2900: The first defensive walls are built in Mesopotamia.

2686–2160: The first pharaoh Djoser unites upper and lower Egypt for the first time, establishing the Old Kingdom.

2560: The Egyptian architect Imhotep finishes the Great Pyramid of Cheops on the Giza Plateau.

780–560: Greeks send settlers to create colonies in Asia Minor.

776: Legendary start of the Ancient Olympics.

753: Legendary founding of Rome.

410: Rome is sacked by the Visigoths.

451: Attila the Hun (406–453) faces the Visigoths and Romans together in the Battle of Chalons. He then invades Italy but is convinced to withdraw by Pope Leo I.

453: Attila the Hun dies.

455: Vandals sack Rome.

476: Arguably, the western Roman Empire ends when Emperor Romulus Augustulus is removed from office.