How Fast Is the Speed of Sound? / Mr. Denjiro's Happy Energy! #889
24K views4 days ago
How to See Without Glasses / Mr. Denjiro's Happy Energy! #888
191K views11 days ago
A Weapon from Ancient Rome: Plumbata / Mr. Denjiro's Happy Energy! #887
147K views2 weeks ago
Human Communication Device / Mr. Denjiro's Happy Energy! #886
53K views3 weeks ago
手笛 ハンドホイッスル/ Hand Whistle *Audio in EN / DE / FR / PT / ES
92K views1 month ago
重力って楽しい！/Gravity is fun!
65K views1 month ago
Where Does the Sound of a Finger Snap Come From? / Mr. Denjiro's Happy Energy! #884
240K views1 month ago
Bubble Pulse: Underwater Explosions! / Mr. Denjiro's Happy Energy! #883
119K views1 month ago
The Solar Engine / Mr. Denjiro's Happy Energy! #882
86K views1 month ago
Kugatachi: Ancient Japanese Trials / Mr. Denjiro's Happy Energy! #881
323K views1 month ago
Let's See X-rays! / Mr. Denjiro's Happy Energy! #880
88K views2 months ago
Bronze Axe / Mr. Denjiro's Happy Energy! #879
148K views2 months ago
Unpredictable Super Balls?! / Mr. Denjiro's Happy Energy! #878
115K views2 months ago
The Power of Shape Memory / Mr. Denjiro's Happy Energy! #877
58K views2 months ago
Bottle Flip / Mr. Denjiro's Happy Energy! #876
64K views3 months ago
Fire Walking / Mr. Denjiro's Happy Energy! #875
260K views3 months ago
The Da Vinci Bridge / Mr. Denjiro's Happy Energy! #874
142K views3 months ago
The Periodic Table and Alkali Metals / Mr. Denjiro's Happy Energy! #545
26K views3 months ago
メタリックス！/Metallics!
24K views3 months ago
Rocket Stove / Mr. Denjiro's Happy Energy! #873
157K views3 months ago
Sound Wave Rocket / Mr. Denjiro's Happy Energy! #871
60K views4 months ago
Chatter Ring / Mr. Denjiro's Happy Energy! #870
51K views4 months ago
You Can Make Glass from Rock! / Mr. Denjiro's Happy Energy! #869
59K views4 months ago
Generating Electricity in the River! / Mr. Denjiro's Happy Energy! #868
101K views5 months ago
熱くなる科学/Science that gets hot
41K views5 months ago
Fire Arrows / Mr. Denjiro's Happy Energy! #867
755K views5 months ago
Shoot Water with Water Hammer! / Mr. Denjiro's Happy Energy! #866
78K views5 months ago
Sodium+Water=Explosion! / Mr. Denjiro's Happy Energy! #865
172K views5 months ago
Why Waves Get Taller / Mr. Denjiro's Happy Energy! #864
177K views5 months ago
Throw!~Ancient weapon~
61K views5 months ago
The Monty Hall Paradox / Mr. Denjiro's Happy Energy! #863
38K views6 months ago
Get Electricity from the Air! / Mr. Denjiro's Happy Energy! #862
73K views6 months ago
The Truth Behind Smoke Screens / Mr. Denjiro's Happy Energy! #861
69K views6 months ago
Can You Stop a Bullet with Liquid?! / Mr. Denjiro's Happy Energy! #860
190K views6 months ago
Proving the Existence of Atmospheric Pressure / Mr. Denjiro's Happy Energy! #859
71K views7 months ago
バランスって大事！/Balance is important!
43K views7 months ago
The Ultimate Pogo Stick?! / Mr. Denjiro's Happy Energy! #858
74K views7 months ago
Musical Plastic Bottles / Mr. Denjiro's Happy Energy! #857
48K views7 months ago
Chainsaw Kickback: The Hidden Danger / Mr. Denjiro's Happy Energy! #856
1M views7 months ago
Heatstroke Prevention: Cooling Rings / Mr. Denjiro's Happy Energy! #855
139K views8 months ago
科学はアートの夢を見るか？/Does science dream of art?
76K views8 months ago
Chain Whip / Mr. Denjiro's Happy Energy! #854
319K views8 months ago
Kangaroo Shoes / Mr. Denjiro's Happy Energy! #853
115K views8 months ago
Stone Skipping / Mr. Denjiro's Happy Energy! #852
123K views8 months ago
Dust Explosion / Mr. Denjiro's Happy Energy! #851
705K views8 months ago
つめた～い/Sooo cold
76K views8 months ago
Discovering the Nucleus Using Gold! / Mr. Denjiro's Happy Energy! #850
195K views9 months ago
Spiral Pump: A Perpetual Motion Machine?! / Mr. Denjiro's Happy Energy! #849
622K views9 months ago
Foxhole Radio / Mr. Denjiro's Happy Energy! #848
231K views9 months ago
How to Pump a Swing / Mr. Denjiro's Happy Energy! #847
68K views9 months ago
Klein Bottle / Mr. Denjiro's Happy Energy! #846
1.6M views9 months ago
Dancing String / Mr. Denjiro's Happy Energy! #845
135K views10 months ago
楽器は震えている/The instrument is vibrating
51K views10 months ago
Ancient Inca Whistling Vessel / Mr. Denjiro's Happy Energy! #844
113K views10 months ago
The Monkey and the Hunter / Mr. Denjiro's Happy Energy! #843
72K views10 months ago
Staff Sling / Mr. Denjiro's Happy Energy! #842
79K views10 months ago
Plasma / Mr. Denjiro's Happy Energy! #841
347K views10 months ago
Solar power
76K views11 months ago
Morse Code Transmitter / Mr. Denjiro's Happy Energy! #840
71K views11 months ago
The Trajectory of a Cannonball / Mr. Denjiro's Happy Energy! #838
357K views11 months ago
The Vacuum-Packed Human / Mr. Denjiro's Happy Energy! #839
1.2M views11 months ago
Axe Throwing! / Mr. Denjiro's Happy Energy! #837
550K views11 months ago
Pulleys on a Giant Crane / Mr. Denjiro's Happy Energy! #836
86K views1 year ago
回るとどうなる？/What happens when you turn it?
133K views1 year ago
The Melodica / Mr. Denjiro's Happy Energy! #835
39K views1 year ago
Video Tricks with a Smartphone / Mr. Denjiro's Happy Energy! #834
25K views1 year ago
もっと光を！/More light！
60K views1 year ago
Let’s See Cosmic Rays! / Mr. Denjiro’s Happy Energy! #831
84K views1 year ago
Why Boomerangs Always Come Back / Mr. Denjiro’s Happy Energy! #830
87K views1 year ago
Spinning in Midair!: The Cat Righting Reflex / Mr. Denjiro’s Happy Energy! #829
724K views1 year ago
The Mechanism Behind Your Voice / Mr. Denjiro’s Happy Energy! #828
245K views1 year ago
投げてみた/I tried throwing it
113K views1 year ago
Hard Steel’s Weakness / Mr. Denjiro’s Happy Energy! #827
1.9M views1 year ago
Japanese Martial Arts: Kusarigama / Mr. Denjiro’s Happy Energy! #826
458K views1 year ago
Synchronization in Our Daily Lives / Mr. Denjiro’s Happy Energy! #825
232K views1 year ago
A Charcoal Phone?!: The Carbon Microphone / Mr. Denjiro's Happy Energy! #824
72K views1 year ago
コレの仕組み/How this works
496K views1 year ago
Jumping from Up High with Just a Stick?! / Mr. Denjiro's Happy Energy! #823
491K views1 year ago
Gravity on the Moon: Leaping High / Mr. Denjiro's Happy Energy! #822
87K views1 year ago
Archimedes' Heat Ray / Mr. Denjiro's Happy Energy! #821
185K views1 year ago
How to Start a Fire / Mr. Denjiro's Happy Energy! #820
112K views1 year ago
Optical Illusions to Trick Your Brain! / Mr. Denjiro's Happy Energy! #819
249K views1 year ago
レンズ/lens
59K views1 year ago
How to Throw Playing Cards! / Mr. Denjiro's Happy Energy! #818
378K views1 year ago
Liquid Nitrogen Rocket / Mr. Denjiro's Happy Energy! #817
138K views1 year ago