03:01

Vacuum-Insulated Cups / Mr. Denjiro's Happy Energy! #800

03:01

Atlatl: A Weapon of Ancient Times / Mr. Denjiro's Happy Energy! #799

03:01

The Magic of the Will-O'-the-Wisp / Mr. Denjiro's Happy Energy! #798

08:20

家で簡単実験②/Experiments you can do at home

03:01

Sunburn and UV Radiation / Mr. Denjiro's Happy Energy! #797

03:01

Stone on Stone: Starting a Fire / Mr. Denjiro's Happy Energy! #796

08:20

風船の科学/The Science of Balloons

03:01

Water Vapor Explosion / Mr. Denjiro's Happy Energy! #795

03:01

How Cassette Tapes Work / Mr. Denjiro's Happy Energy! #794

08:20

ゴムは面白い/Rubber is interesting

03:01

Ballista: The Ancient Weapon / Mr. Denjiro's Happy Energy! #793

03:01

The Science behind Water Repellency / Mr. Denjiro's Happy Energy! #792

08:20

科学クッキング/science cooking

03:01

Boom! The Thermite Reaction / Mr. Denjiro's Happy Energy! #791

03:01

Fly Straight with the Gyroscopic Effect! / Mr. Denjiro's Happy Energy! #790

08:08

科学マジック/science magic

03:01

Start a Fire like the Iceman / Mr. Denjiro's Happy Energy! #789

03:01

Casts and Cast Saws / Mr. Denjiro's Happy Energy! #788

08:20

遊びの科学/science of play

03:01

Bolas: An Ancient Weapon / Mr. Denjiro's Happy Energy! #787

03:01

Sewing Machines that Operate Needles and Threads / Mr. Denjiro's Happy Energy! #786

08:20

水のチカラ/The Power of Water

03:01

Cooking with Mr. Denjiro! Electric Bread/ Mr. Denjiro's Happy Energy! #785

03:01

石の中の結晶！ジオード／ Geodes: Rocks with Crystals Inside

08:20

磁力のパワー/Power of magnetism

03:01

The Principles of Buoyancy / Mr. Denjiro's Happy Energy! #783

03:01

Screws and Matchlocks / Mr. Denjiro's Happy Energy! #782

08:21

天気の科学/The Science of Weather

03:01

The History of Mirrors / Mr. Denjiro's Happy Energy! #781

03:01

The Exploding Prince Rupert's Drop / Mr. Denjiro's Happy Energy! #780

08:20

音の振動/Sound Vibration

03:01

Newton's Beads that Defy Gravity / Mr. Denjiro's Happy Energy! #779

03:01

Do Bubbles Make Objects Sink? / Mr. Denjiro's Happy Energy! #778

08:20

ふしぎな液体たち①/Strange Liquids

03:01

The Science of Bows: The Compound Bow / Mr. Denjiro's Happy Energy! #777

03:01

A Box for Seeing Radiation / Mr. Denjiro's Happy Energy! #776

08:20

刃物の歴史/History of Cutlery

03:01

The Relationship Between Earth and Outer Space: Radiative Cooling / Mr. Denjiro's Happy Energy! #775

03:01

Add Fuel to the Fire! / Mr. Denjiro's Happy Energy! #774

08:20

スーパースロー①/Super Slow-Motion

03:01

Infrared Radiation Magic / Mr. Denjiro's Happy Energy! #773

03:01

How an Air Conditioner's Heater and Cooler Work / Mr. Denjiro's Happy Energy! #772

08:30

古代の武器①/Ancient Weapons

03:01

How Lighters Make Fire / Mr. Denjiro's Happy Energy! #771

03:01

How Heated Vests Work / Mr. Denjiro's Happy Energy! #770

08:20

The Science behind Flying Discs / Mr. Denjiro's Happy Energy! #769

03:01

フライングディスクの科学／The Science behind Flying Discs

03:01

The Magic of Sand / Mr. Denjiro's Happy Energy! #768

08:20

音楽の科学①/The Science of Music

03:01

Let's Make a Glass Pen! / Mr. Denjiro's Happy Energy! #767

03:01

The Science of Ropes / Mr. Denjiro's Happy Energy! #766

07:51

家で簡単実験①/Experiments you can do at home

03:01

Slingshots and the Power of Rubber/ Mr. Denjiro's Happy Energy! #765

03:01

Generating Electricity with a Drill / Mr. Denjiro's Happy Energy! #764

08:21

天才！テスラ①/The Genius Tesla

03:01

The Science of Bubbles / Mr. Denjiro's Happy Energy! #763

03:01

Rocket Launch / Mr. Denjiro's Happy Energy! #762

08:21

身体のしくみ①/The science of health

03:01

Putting Out Fire with Sound / Mr. Denjiro's Happy Energy! #761

03:01

The Properties of Iodine / Mr. Denjiro's Happy Energy! #760