結果 : did pencils ever contain lead
6:24

Do #2 Mechanical Pencils Exist? Lead Grades Explained

JetPens
104,579 回視聴 - 4 年前
0:53

Were pencils ever lead?

Λsk Λbout Essentials
15 回視聴 - 8 か月前

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1:00

Why Pencils Contain Lead: when it is poisioness #youtubeshorts #trending #viral #shortvideo #science

Educational Tutorials
12 回視聴 - 1 年前
0:22

Did pencils really need to evolve like this?? #amazon #amazonfinds #amazonhome #amazonlife

GiftGenius (Official Page)
27,513,357 回視聴 - 1 年前
0:51

Where did mechanical pencils come from? #shorts

History of Everything Podcast
277,421 回視聴 - 1 年前

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0:19

Unveiling the Mystery: How Pencils Get Their Lead - Explained #shorts

VizoMind
2,452 回視聴 - 10 か月前
0:23

These Pencils Have a Secret 🤫 #shorts

JetPens
23,569 回視聴 - 7 か月前
4:15

Graphite vs Lead Pencils: Which Is Better To Use?

Officely
1,898 回視聴 - 1 年前
6:45

Everything you ever wanted to know about Mechanical Pencils! 🤖✏️

JetPens
39,410 回視聴 - 6 か月前
12:46

Testing 150 YEAR OLD Lead Pencils..(do they still work?)

SuperRaeDizzle
863,629 回視聴 - 3 年前
0:57

Did you ever have one of these pencils? #shorts

Rachel Pence
2,305 回視聴 - 2 年前
0:15

Lead pencils play role in world’s energy transition #news #newsforteens #climate

WONKedition
17 回視聴 - 1 年前
0:50

Fun FACTS About Pencils and the ✨QUIRKY✨ case of LEAD POISONING!

XyroDoughnuts
7,785 回視聴 - 4 か月前
0:23

What Do H, B, and HB Mean on Pencils? Meaning Explained

Sam Xperience
797 回視聴 - 3 週間前
0:27

Top 10 Mechanical Pencils!

bungu
1,047,796 回視聴 - 1 年前
1:00

How do Mechanical Pencils Work? #shorts

Branch Education
353,546 回視聴 - 3 年前
1:01

Testing lead hardness with $10 drawing pencils #themilkweedman #lead #pencils #theotherpreciousmetal

The Milkweed Man
103 回視聴 - 1 年前
0:54

"From Lead to Graphite: The Fascinating Evolution of Pencils | Art History and Discoveries"

DRENSTRO
82 回視聴 - 1 年前
0:39

These mechanical pencils enable you to extend the lead while  maintaining your original grip.

chicwrite
26,058 回視聴 - 1 年前