About the Course

Gross Science: Microorganisms

The human body is amazing— and sometimes, gross. From the blood inside us to the gas that comes out, each slimy, gunky, or smelly part has a vital role to play in keeping us healthy. In this three-week mini course, we’ll dive deep into the microscopic world of bacteria, viruses, fungi, and parasites. What do we breathe in or eat that makes us sick? What organisms may be living on our eyelashes and under our fingernails? How do we treat illnesses and diseases caused by microscopic things? We’ll explore these questions and bodily functions through online discussions, mini-lessons about body systems, research articles, and short at-home experiments, and gain a better understanding of the microscopic world—especially those things you don’t want to discuss at the dinner table!

Time commitment: 2.5-3.5 hours per week (1.5 hours of class time, 1-2 hours of independent work). Course will include 3 sessions over 3 weeks.

Course Overview

About Mini Courses

Taught over 1-3 sessions, these short survey courses are designed to give students the opportunity to sample a topic, engage with a community of advanced learners, and take a course that suits their busy schedule.

The content in Gross Science: Microorganisms overlaps with the CTY course Grossology. Students who have already taken Grossology may wish to consult with an enrollment advisor before selecting this course.

This course is

ungraded.

Classes

Register for an Online course by selecting an open class below. If no open classes are listed, then course enrollment is currently closed. Note: You will need to have an active CTY Account to complete registration through MyCTY.

Tuesdays
-
2 weeks
7:00 p.m. (ET)
$446
Enroll

Testing and Prerequisites

  Math Verbal
Required Level CTY-Level or CTY-Level
Check your eligibility using existing test scores If you do not have existing test scores:

Students must achieve qualifying scores on an advanced assessment to be eligible for CTY programs. If you don’t have qualifying scores, you have several different testing options. We’ll help you find the right option for your situation.

Sign up for Testing Learn More

Cost and Financial Aid

  • Tuition
    • Varies
  • Application fee
    • Nonrefundable Application Fee - $15 (Waived for financial aid applicants)
    • Nonrefundable International Fee - $20 (outside US only)

CTY Financial Aid Availability for Online Programs

Academic Year 2025-26 (Course start dates July 1, 2025- June 30, 2026): Financial Aid funding is currently available for all eligible students while funding lasts. If interested in applying for financial aid, please select a course with start date of July 1, 2025, or later.

Learn More

Course Materials

Please acquire all course materials by the course start date, unless noted as perishable. Items marked as “perishable” should not be acquired until the student needs them in the course. If you have questions about these materials or difficulty locating them, please contact [email protected].
 

Families will be notified by email of any required materials one week prior to the course start date. 

Technical Requirements

This course requires a computer with high-speed Internet access and an up-to-date web browser such as Chrome or Firefox. You must be able to communicate with the instructor via email. Visit the Technical Requirements and Support page for more details.

About Science and Engineering at CTY

Our Science and Engineering courses bring a variety of science topics to life. By introducing topics not covered in standard science curricula, we build and reinforce your science knowledge. All courses support critical thinking, problem solving, and reasoning, and encourage a real-life, hands-on approach to learning about Earth, space, life sciences, chemistry, and the physical world. Guided by expert CTY science educators, you’ll master science lab kits, perform hands-on experiments using common household objects, participate in dynamic group discussions, or prepare for AP exams.

More engaging science enrichment courses!

In the newly revised Inventions in Engineering course, students bring fantasy into reality by creating inventions to solve the problems of favorite fictional characters and the real world alike. A new unit in Introduction to Forensics asks students to evaluate the validity of various kinds of forensic evidence and its impact on the lives of individuals, and to provide recommendations on which types of forensic evidence should be admissible in the criminal justice system. In Household Chemistry, students engage in newly revised activities that help develop their skills in making and recording detailed observations using all 5 senses as they explore states of matter and the role chemistry plays in their daily lives.

Meet our Science and Engineering Instructors