Dr. Stone: 5 times the science was academically sound (and 5 times it didn’t make any sense)

Since the manga’s debut in 2017 and the anime’s subsequent release in 2019, Dr. Stone has redefined classic shonen tropes by showing that brains are more powerful than muscles. The series follows high school sage Senku Ishigami on his uphill ascent to revive modern technology after a mysterious global event turned all human beings to stone.

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After reliving 3,715 years in the future, Senku sets out to reinvent science from scratch. Along the way, the show explores many scientific techniques that range from the basic to the intensely complex. It goes without saying that some explanations translate better than others.

10 Right: Coriander Lime Replica Cola

Dr. Stone Senku Cola.

In a gesture of appreciation as satisfying as it is sweet, Senku recreates the classic tail for the modern mentalist, Gen Asagiri. Senku uses carbonated water, coriander, honey caramel and lime to replicate Coca-Cola. Essentially, the lime and coriander carry most of the flavor, the honey caramel provides the characteristic dark color, and the carbonated water provides the refreshing fizz.

Strain the coriander pulp and voila, a homemade Coca-Cola. Since Coca-Cola was originally created as a medicine, it’s no surprise that it shares a flavor profile with an ingredient that about 14% of people think tastes like soap.

9 Incorrect: Scheelite is not native to Japan

A piece of scheelite from Dr. Stone.

A major turning point near the end of Dr stoneThe first season is the discovery of scheelite. Morale was low in the Kingdom of Science after realizing that its copper tubing would not be strong enough to withstand the heat required to create a working cell phone.

Fortunately, they find scheelite that can be used to make tungsten, the strongest natural metal on Earth. However, scheelite forms under very specific conditions, which makes it one of the rarest substances on the planet. Senku’s team is much more likely to find wolframite, a quartz-based mineral that is well known for its use in tungsten forging and is actually native to Japan.

8 Correct: The North Star Moves

Senku Ishigami and his sextant from Dr. Stone.

When it comes to science and math, Senku Ishigami is rarely wrong. However, after several millennia in stasis, it is not surprising that something has managed to go unnoticed by the genius. At first, Senku discovers that his sextant calculations are wrong. Since sextants use mirrors to create an angle between a celestial body and the horizon for navigation purposes, it is vital that the user uses the correct celestial body to obtain the correct results.

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Later, Senku realizes that he was away because the Pole Star he was using as a guide had changed over the past 3,715 years. This is because the Pole Star is outside of Earth’s axis of rotation, making it appear to arc for long periods of time. While it marks true north currently, when Senku finally awakens, the star Gamma Cephei will position itself to be the new north star.

7 Wrong: Kaseki should be an expert in all trades and a master of one

Master craftsman, Kaseki from Dr. Stone.

It is a well known statistic that it takes approximately 10,000 hours to be considered a master of a certain skill. So it’s lucky for Senku and his love of science that Ishigami Village’s resident craftsman Kaseki has an uncanny knack for doing any art project he puts his hands on in one go. As a natural craftsman, Kaseki invested the time to learn how to build impressive woodwork like the bridge leading to Ishigami village and beautiful work like Kohaku’s shield.

However, it is highly unlikely that he will have similar success creating complex structures such as engines and vacuum tubes, especially since these concepts have been lost for thousands of years and his only direction comes from the drawings of a teenager.

6 Correct: his modified katanas would really work

Dr. Stone's Kaseki forging a katana.

After an attack from the Empire of Might, Senku decides to arm his own warriors with katanas to prepare for Tsukasa’s next assault. Since time is short, Senku proposes that during counterfeiting, they bend the metal twice instead of the traditional 20 times.

It is true that in traditional Japanese sword smithing, the iron of the sword can be bent 10 to 20 times to make the swords stronger and more durable, as repeatedly bending the heated metal removes impurities and evens out the carbon content of the sword. Fortunately for The Kingdom of Science, two or three passes are enough to make a strong enough weapon.

5 Wrong: Thomas Edison shouldn’t get all the credit for creating the light bulb

Many fans probably noticed this mistake when Senku credited Thomas Edison with the invention of the light bulb. In fact, Edison was just one of many inventors who experimented with incandescent lighting since the 18th century by heating metal filaments to such a high degree that they emitted a constant glow.

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In reality, Thomas Edison cannot even be credited with producing the first major use of light bulbs since British scientist Joseph Swan’s light bulbs powered the first fully electrified public building. Instead, Edison used marketing and leveraged patent laws to break through to the forefront of electrical innovation credit. However, as a warning, Edison’s only significant contribution to light bulbs was the invention of bamboo filaments, which Senku used.

4 Correct: records can be made from glass bottles

Senku Ishigami of Dr. Stone showing everyone his glass record.

Senku finding his father’s recording and discovering the origins of Ishigami Village marked a great milestone for The Kingdom of Science. As smart as his son, Byakuya Ishigami recorded a disc from the bottom of a glass bottle to leave a message for his son to eventually discover.

It may seem far-fetched that a record can be made from anything other than vinyl, but the concept has proven its worth. Since records are created by funneling audio waves into scratched grooves in vinyl, it is theoretically possible to create a record on any flat, carve surface. Playable discs have been made of wood, chocolate, and even ice.

3 Wrong: the sulfa should have dyed Ruri a different color

Senku Ishigami from Dr. Stone showing his sulfonamide compounds.

Much of Dr stoneThe first season is dedicated to trying to formulate a cure for Kohaku’s sister, Ruri. The team gathers supplies to create a sulfur-based drug called sulfa that, thankfully, manages to cure Ruri. However, what is lost in the show is the color of the original drug.

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In the program it is represented as a white powder. However, certain chemicals in its formula come from synthetic dyes, which gives it an intense reddish color. When the original creator of the medicine used it to cure his own daughter’s strep throat, it was strong enough to permanently stain her throat red.

2 Correct: sulfa is still an effective way to fight respiratory infections

One of Senku’s greatest achievements is his successful recreation of a sulfur-based antibiotic called sulfa. Since you choose this approach because the natural bacteria used to produce penicillin are so rare, Senku is widely considered to be recreating the real-world prepenicillin antibiotic Prontosil.

Prontosil, created in 1935, is the first drug that successfully fights bacterial infections. Since there isn’t much clear on Ruri’s disease other than respiratory distress, Senku takes a risk and administers the drug, hoping it isn’t a chronic disease like tuberculosis. It is revealed that Ruri suffered the longest case of pneumonia in the world and sulfa succeeded. Even though it has been largely superseded by more readily available medications such as penicillin and amoxicillin, Prontosil is still used to treat particularly aggressive bacterial infections.

one Incorrect: Ishigami Village could not exist

Byakyua Ishigami and her Dr. Stone's space crew.

One glaring incongruity that the program overlooks is the utter infeasibility surrounding Ishigami Village. According to the show, Ishigami Village is descended from Seknu’s father and five other astronauts who were out of the world at the time of the stoning event. Even considering that the critical lack of genetic diversity doesn’t kill them in the first hundred years or so, it takes about 275 years to make ten generations.

Ishigami Villiage is about 133 generations from Senku’s father. Think of the time span from Ancient Greece to now. It is monumentally impressive and statistically unlikely that the descendants of Byakuya Ishigami still live in the same place, much less in a Stone Age capacity.

NEXT: Dr. Stone: Senku’s Most Impressive Inventions In Season 1, Ranked

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