zdenek svindrych

@iowatech80 @Rainmaker1973 You can use a very high F-stop lens to get the whole scene in focus. And of course, you record at high frame rate and play it back slower.

@Rainmaker1973 Can this be used in reverse to make miniature sets seem more real? Is that how they do that?

When the lens of a camera tilts so that it is no longer parallel to the camera's image sensor, it shifts the plane of focus and alters the depth of field. These are tilt shift views of real life scenes. [📹 Daniel Keintjem / dk.jooo] twitter.com/i/status/17782…

@Rainmaker1973 Well, the first step is the general logarithm formula, that can be written as b^a = exp(a*ln(b)) So we're evaluating i*ln(i). But what is ln(i)? We can turn around the c=ln(i) into exp(c)=i. That's where we use the Euler's formula to find ln(i)=1/2Pi*i cf @Marco_Piani

This is one of the most captivating equations in mathematics. The so called Euler's formula also tells us that iⁱ is a real number. To prove it, you just need to consider that eⁱˣ = cosx + i sinx and solve it for x = 𝜋/2.

Military briefing: the Israeli bombs raining on Gaza ft.com/content/7b407c… via @ft Comments have not been enabled for this article... But honestly, dropping 2000lb bomb in Gaza, so densely populated, and killing 43 people, that's a miracle!

But we already have the high-resolution crystal structure (down to 0.01 Angstrom)!

New "Loki" variant of monomeric EGFP out there! We're in the process of determining the fluorescence lifetime...

@FabioSi57695354 @Rainmaker1973 Wondering how can people expose themselves to harmful levels of radiation using uranium glass. Any hits?

In the past, people exposed themselves to harmful levels of radiation by using uranium glass, pieces capable of glowing under blacklight. A mosaic found in the Gulf of Naples, Italy, indicates that this type of material was already used since ancient times. The presence of uranium imparts a green or yellowish tint to the glass, and under blacklight, it makes it glow.

This is a ring made of resin / epoxy mixed with strontium aluminate powder, whose main property is phosphorescence: a glow that lasts relatively long after being exposed to light [📹 secret.wood] twitter.com/StreetArtDream…

@Rainmaker1973 Want to see anyone trying to dig this in Vermont.

The Dakota fire pit is an efficient, simple fire design where the fire burns from the top downward, drawing a steady, laminar stream of fresh air from the air hole as it burns, achieving near complete combustion with little or no seen smoke [read more: buff.ly/3eAjeKo]

Long-chain fatty acyl-coenzyme A activates the mitochondrial fission factors MiD49 and MiD51 by inducing their oligomerization biorxiv.org/content/10.110…

@Rainmaker1973 The one-word-at-a-time subtitles are terrible. Can't wait to see cameras with 3:29 aspect ratio being used in portrait mode - then it's going to be one-letter-at-a-time subtitles :-xD

How bees are trained to detect explosives [video: buff.ly/3p0Z8Re] twitter.com/simzwitschert/…

@OdedRechavi Hilarious! This guy knows pretty well what to do to show you what not to do :-).

When the PI insists on showing you how it's done twitter.com/ThecoolFigen/s…

@JeremyKinman @Rainmaker1973 Not deadly at all. Maybe if someone drops a quart of mercury on you... Surprisingly, it's hard to find LD_50 of mercury metal. You'll find all mercury salts and organic compounds, but not the bare metal. I bet it's safer than table salt (in grams per kg body weight)! Short term.

@Rainmaker1973 So neat, so deadly!

Since Mercury is 13.3 times denser than water, that is what happens when a cannonball is dropped into it [video, BBC: buff.ly/3zYySXj]

@Rainmaker1973 I love mercury! Too bad you don't get to see pools full of mercury anymore...

@Laura_Breimann @DartBioMT @dartmouth @IMCF_Vinicna @science_charles @BurdikovaZuzana @svindrych @CharlesUniPRG @haesleinhuepf I just published the final repository. You can find our presentations and exercises from the Dartmouth Workshop available #OpenAccess on Zenodo here: doi.org/10.5281/zenodo… Hope you will like it 🤓

@OdedRechavi Thought it smoked sausage. I had to look really closes to see it's a sofa.

Organoids are amazing

@Rainmaker1973 But why the droplets cause bursts of light? One might argue that it has to do with dissolved oxygen or something. In reality, the light is already there (under water), just cannot escape during total internal reflection (epod.usra.edu/blog/2014/06/s…) - until the surface's disturbed...

Sea of stars. Bioluminescence in the rain. [why it happens: buff.ly/3C0SZav] [video: buff.ly/45EHpQc]

@Rainmaker1973 I guess it could float, but definitely not fly...

Sky Cruise is a concept for a nuclear-powered sky hotel. This video rendering shows the aircraft designed to fly with 20 electric engines, housing over 5,000 guests in nearly nonstop flight [full video, Hashem Al-Ghaili: buff.ly/3Op8VrE]

@Rainmaker1973 I'd like to see this at more than 3 mph!

A bike with wheels shaped like a Reuleaux triangle, the simplest and best known curve of constant width other than the circle [read more: buff.ly/45l1aMs] [full video, The Q: buff.ly/3WpRyMk]

@Rainmaker1973 Much better than zebrafish!

Cystisoma is a crustacean that lives between 600-1000 m deep in the ocean. Its body is totally transparent: only its eyes are pigmented. This one has a brooding pouch full of orange eggs [read first: buff.ly/3vmJkIj] [📹 Alejandro Damian-Serrano] twitter.com/antropoteuthis…

According to @Google 0.000028 is not a positive number! But it's close: 0.000029 already satisfies Google's positivity constraint :-).

@Rainmaker1973 ... can even turn your solar panel into lava!

Solar energy concentration technology using Fresnel lenses is an effective way to make full use of sunlight. They can even turn a rock into lava. [read more: buff.ly/3l1o1Go] [source, joemyheck: buff.ly/3yNfGet]