Aluminum and titanium are described along with their properties and common uses. Aluminum is a light, silvery metal that is abundant in nature and commonly used in electricity, transportation, construction and packaging. It can be recycled infinitely without loss of properties. Titanium is also described with its discovery, properties as a transition metal, and common uses in alloys, aerospace, surgery and other industries. Biochips and biosensors are also summarized, with biochips enabling simultaneous biochemical reactions for screening and detection, while biosensors combine a biological component with a transducer and detector for analytical purposes.