Bryan Silverman was in high school when he had a revelation – people are always reading in the bathroom. Why not put advertisements on toilet paper? Bryan started his company, Star Toilet Paper, with less than $1,000 while studying neuroscience at Duke University with his brother, Jordan. The toilet paper features 8 advertisements per sheet that are printed using vegetable-based ink on the top ply, making it safe to use.

Venues that use the toilet paper receive it for free if they have a sufficient amount of vendors that purchase ads on the toilet paper. Vendors pay half a cent per sheet (about $5 per roll) to have a spot on the toilet paper where they can print coupons, QR codes, website addresses, etc. This is a unique way for event venues to save money on toilet paper as well as a new way to make ensure that your brand is known.

Anthony Gonzales was a college rugby player at Arizona State, and used his experiences to inspire FitGuard, which is a mouthguard that helps diagnose concussions. Once, Anthony received a concussion while playing rugby and couldn’t recall where he was or what position he was playing. He almost re-entered the game, and was held back by one of his teammates who was a pre-med student. If he had re-entered the game, he could have sustained permanent brain damage. This incident inspired him to create a device with his FitGuard is geared toward middle and high school athletes, but has hopes of being involved in college and professional sports as well.

Built in to the FitGuard are an accelerometer and a gyroscope that measure impact and send the information over Bluetooth to a smartphone with the FitGuard app. Additionally, a luminescent portion of the mouthguard changes from green to blue or red, depending on the severity of the impact that it registers. After a serious hit, a parent or coach with the app can look at the data and see if the player should go to the hospital or if they are OK to go back into the game. Coaches can also look at the data over time and analyze which drills have the highest potential for concussions and adjust their practice schedule accordingly.

Jess Ekstrom was 20 when she did an internship with a wish-granting organization for children with cancer. She saw how much young girls were affected by losing their hair from chemotherapy, and how much they enjoyed wearing headbands because they didn’t have hair. This inspired her to start Headbands of Hope, which began selling headbands  and would donate a headband to a child with cancer as well as $1 to cancer research for each headband sold. Headbands for Hope now also sells buffs, necklaces, bracelets, and many other items, and for each item sold, a headband is given to a child with cancer.

Jess was CEO of Headbands for Hope for half of her college career, and talks about how being an entrepreneur in college is very convenient in her Entrepreneur Magazine article. She was able to make her class assignments relate directly to her business so she could receive professional feedback that allowed her to have clear direction on how to improve her business. She is a great example of what Michael Kobold said in class when he visited – you can never start too early.

Jess also does public speaking at colleges and corporations. In her college keynote, she emphasizes that there is no need to put off a business until after college and it is beneficial to start as soon as possible. Her blog is also very interesting, I recommend you check it out!

When Aaron Goldstein was a student at UPenn’s Wharton School of Business, one of this friends was suffering from leukemia. During chemotherapy, his friend had to take frequent body temperature readings, and if it got too high he needed immediate medical attention. He went to bed one night with a normal body temperature and then woke up in the middle of the night with a high fever and needed to go to the ER. Aaron saw a simple solution to this problem.

Aaron developed Fever Smart, which is an app that monitors a person’s body temperature constantly with a thermometer patch that goes on the underarm. The patch sends live data to the app, allowing the user can track the temperature changes over time and will even be notified if the patient’s body temperature gets to dangerous levels. By providing continuous updates, body temperature can be monitored during sleep and notify the user long before the ailing person wakes up in a sweat and needs to be taken to the hospital.

From his work with Fever Smart, Aaron was named Entrepreneur Magazine’s College Entrepreneur of 2014. You can now order a Fever Smart patch and app for $130.

Zach Galant is a Stanford graduate who always has something he is working on. He specializes in software development and most recently is working on CodeHS, which is a computer science curriculum provider for high schools. Teachers and schools can create accounts on the site from which they receive course curricula for introduction computer science classes through AP Computer Science. Depending on their plan, they can also receive unique teacher resources like automatic grading, custom problems, and webinar access for useful tips when teaching computer programming courses.

CodeHS is especially popular in inner city school systems that need a help to kickstart their Computer Science programs. In this day and age, coding is becoming more and more important and could become as critical to success as learning to read and write. CodeHS makes it easy for schools to begin teaching the invaluable skill of computer programming to kids that otherwise wouldn’t have access to it.

Zach has also worked on a number of different unique projects. In college at Stanford, he and a few of his classmates created a computer program that can predict the gender of a Facebook user, with around 70% accuracy, when given a sample status update. The writeup for that is quite interesting and can be found here. He has also worked on a Random Tweeter engine that creates tweets based on trending topics. A full list of his projects can be found here.

Zach is not only creating nifty computer programs, but is using his passion for programming to help others learn how to program and be relevant in an increasingly technical job market. He shows us how personal drive and knowledge can be utilized to create unique content and help others do the same.

Moziah Bridges is the founder of Mo’s Bows, which he started by hand-making and selling bowties in unique colors and patterns. Mo is currently 13 years old and is one of the youngest entrepreneurs to appear on Shark Tank. He is currently in stores in 6 states and Canada and is experiencing such high demand that he no longer takes custom bowtie orders. Mo’s Bows is also expanding to include pocket squares in their product line; he also mentions that he may start offering regular neckties as well.

As someone who wears bowties significantly more than normal neckties, I really appreciate Mo’s Bows’ styles. Bowtie wearers generally are people who prefer to wear colorful paisley or or bright floral designs around their necks. Mo is catering very well to his target audience – he creates bowties that stand out, but aren’t overly loud or gaudy. They are classy, conversation-starting bowties that can be worn to any occasion. He also invites a new market of upcoming bowtie wearers by posting instructions on how to tie bowties and writing in his blog to create content that keeps customers coming back to the site.

Mo has been more entrepreneurial as a tween than most people ever will be, and he is a classic example of going out and doing what you love. He is having a blast making bowties and other fashion items, so even as the CEO of his own company he isn’t really “working” in the typical sense. Mo is just having fun and making money while doing it. It will be exciting to see how Mo’s Bows ends up and if there will be other product developments from Mo in the future.