Eighteen students will compete for the Grand Prize in Google's annual science fair, where teens from all over the world submit their unique inventions, and are judged online by teachers, professors and scientists.

The science fair began four years ago when the search engine giant realized that teenagers around the globe deserve equal opportunity to showcase their innovative projects.

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This year, more than 90 countries have joined the fair with students ages 13 to 18 who featured their ideas in the fields of biology, physics and chemistry and computer, environmental and social sciences, among others.

In the grueling judging process, the 18 students were chosen out of thousands of participants to compete for the grand prize at the Google headquarters in Mountain View, California.

Nine males and nine females were chosen to compete for the age category next month where the champion will be chosen.

Among the finalists is Kenneth Shinozuka, 15, from the United States, who presented a tracking device that would monitor his grandfather. Once the person wearing the device would step into the floor, the pressure caused by the body weight would alert the smartphone of his caregiver.

From India, 16-year-old Arsh Dilbagi was chosen for his ex-generation Augmentative and Alternative Communication (AAC) which allows people who have a speech defect to talk using long and short breaths that can be converted to words and languages using Morse code.

Three 16-year-old finalists were chosen from Ireland - Ciara Judge, Émer Hickey and Sophie Healy-Thow. The three young scientists were able to separate a strain of bacteria that speeds up cereal crop germination by 50 percent and can aid in fighting global food crisis.

Fourteen-year-old Mihir Garimella from the U.S. designed a sensor inspired by a fruitflies visual system that can make a robot's vision as fast as flies'.

Guillaume Rolland, 17, from France, created an alarm clock that emits an odor to help the hearing-impaired.

American student Trisha Prabhu, 14, was included in the list of finalists because of her "rethink alert" which stops students from posting mean messages on social media sites.

Eswar Anandapadmanaban, 16, from the United States created the "ThereNIM" which serves as a respiratory monitor but is more convenient as it does not touch the patient's chest.

Seventeen-year-old Canadian student Hayley Todesco created a bitumen filter from sand and bacteria in IV bags which does not cause harm to the environment.

Mark Drobnich, 13, from Ukraine, invented a microscope that can be remotely controlled to transfer images to laptops or TV screens.

Cynthia Sin Nga Lam, 17, from Australia showcased her "H2prO" which sterilizes wastewater and can produce electricity from hydrogen.

English student Samuel Burrow, 16, created a paint that absorbs pollution when exposed to sunlight.

American duo Sadhika Malladi, 16, and Daniela Lee, 17, utilized MRI scans to predict a how a person with triple-negative breast cancer will react to chemotherapy.

Gregory Martin, 14, United States, was able to make biofuels out of oils from algae.

Russian teen Anastasia Korovyanskaya, 17, created an energy-efficient gas nozzle using ultrasonic waves.

Lastly, Pranav Sivakumar, 14, from the U.S. created the most detailed 3-D maps of the universe to date.

The grand champion of the science fair will win a scholarship grant worth US$50,000 , an all-expenses paid 10-day trip to the Galapagos and a look at the Virgin Galactic Spaceport in New Mexico.

Tagsgoogle science fair, Scientists