Ann (Andini) Makosinski (born October 3, 1997 in Victoria, British Columbia) is a Canadian student, inventor, and internet personality. While still in high school, she created the "Hollow Flashlight," which was recognized with several awards at the 2013 Canada-Wide Science Fair, won the 2013 Google Science Fair for the 15-16 age category, and won several awards at the 2014 Intel International Science and Engineering Fair.

Makosinski appeared on the Tonight Show with Jimmy Fallon twice on the GE Fallonventions segment to demonstrate her inventions. In 2014, she was named one of TIME magazine's 30 Under 30. In 2017 she was named one of Forbes 30 under 30. She is currently a second year student at the University of British Columbia.

Ann Makosinski grew up an only child and is the daughter of two immigrants.

Her mother from the Philippines and her father from Poland. From a young age she showed an interest in tinkering with gadgets and her father, who also tinkered while young, taught her how to solder and build devices. Additionally, she picked up an interest in film on both production and critiquing sides.

Makosinski attended high school at St. Michaels University School. She is currently studying at University of British Columbia. As a child, she developed an early interest in science and invention; her first toy was a box of transistors.

Hollow Flashlight utilizes the thermoelectric effect to convert radiant body heat into electricity to power an LED bulb without batteries. The prototype materials consist of a PVC tube housing, aluminium tube, Peltier tiles, and a circuit, and costs $26. Applying the hand to one side of Peltier tiles while ambient air cools the other side generates enough energy to light several LED bulbs. At 5 °C temperature gradient, the flashlight produces 4 foot-candles of light. At 10 °C temperature gradient, it produces 5 foot-candles of light. At 10 °C ambient temperature, the flastlight maintains a steady beam of light for over 20 minutes. She has since made improvements to the device including the ability to store harvested electricity, adapted into a wearable headlamp, and has garnered interest for commercial production. The device can now provide over 6 lux of light at a distance of 12 inches and can provide on-demand light for 60 minutes without body contact. The "hollow flashlight" was inspired after learning that a friend living in the Philippines struggled in school without any light to study at night and no time during daylight-hours. Makosinski has stated her aim to provide her device for free to people in developing nations.

e-Drink utilizes thermoelectric generators to convert wasted heat from hot drinks to produce electricity. A USB-port is used to charge portable electronic devices. e-Drink can provide a maximum boost of 0.36 Wh, which can extend an iPhone's battery life by 10 to 30 minutes. This product earned her an appearance on Jimmy Fallon in the fall of 2015.