Science has changed throughout the years, and with every advancement science makes it changes what we can accomplish. Each scientific advancement then feeds to the next advancement creating the cycle of human development.
The first scientific event is that of January 28 1986. This date is when the Challenger Space Shuttle exploded shortly after takeoff killing seven astronauts. The astronauts killed in this crash are viewed as heroes they gave up everything for the chance to advance the scientific knowledge of space.
The second event is that of April 24 1990. This is when the Hubble Telescope was placed into orbit by the US space shuttle Discovery. This is an example of an icon the Hubble Telescope is well known by several generations.
The third object is the Segway. The Segway was first released to the public in 2001. The Segway was the first human transporter. It was a self balancing human transporter that could travel in small areas. This is an icon that is easily recognizable.
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