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Seder Plate

The Beginner’s Guide

 

 

 

 

 

 

 

 

 

 

University of Michigan

American Jewish University

University of Richmond

Stanford University

University of Chicago

Harvard Chabad

Passover ‘A Cappella’

Rain & Lightning

After the rain. Personal photograph taken by Mike Anthony biking with his niece in Wirdum, The Netherlands

Today at 15:00 UTC we examine the technical literature about rainwater management in schools, colleges and universities — underfoot and on the roof.  Lightning protection standards will also be reviewed; given the exposure of outdoor athletic activity and exterior luminaires.

We draw from previous standardization work in titles involving water, roofing systems and flood management — i.e. a cross-cutting view of the relevant standard developer catalogs.   Among them:

American Society of Civil Engineers

American Society of Plumbing Engineers

ASHRAE International

ASTM International

Construction Specifications Institute (Division 7 Thermal and Moisture Protection)

Federal Emergency Management Agency

FM Global

IAPMO Group (Mechanical and Plumbing codes)

Institute of Electrical and Electronic Engineers

Heat Tracing Standards

International Code Council

Chapter 15 Roof Assemblies and Rooftop Structures

Why, When, What and Where Lightning Protection is Required

National Fire Protection Association

National Electrical Code: Article 250.16 Lightning Protection Systems

Lightning Protection

Underwriters Laboratories: Lightning Protection

United States Department of Agriculture: Storm Rainfall Depth and Distribution

Risk Assessment of Rooftop-Mounted Solar PV Systems

Readings: The “30-30” Rule for Outdoor Athletic Events Lightning Hazard

As always, our daily colloquia are open to everyone.  Use the login credentials at the upper right of our home page.

“Rainbow Connection”

The “lightning effect” seen in carnival tricks typically relies on a scientific principle known as the Lichtenberg figure or Lichtenberg figure. This phenomenon occurs when a high-voltage electrical discharge passes through an insulating material, such as wood or acrylic, leaving behind branching patterns resembling lightning bolts.

The process involves the creation of a temporary electric field within the material, which polarizes its molecules. As the discharge propagates through the material, it causes localized breakdowns, creating branching paths along the way. These branching patterns are the characteristic Lichtenberg figures.

In the carnival trick, a high-voltage generator is used to create an electrical discharge on a piece of insulating material, such as acrylic. When a person touches the material or a conductive object placed on it, the discharge follows the path of least resistance, leaving behind the branching patterns. This effect is often used for entertainment purposes due to its visually striking appearance, resembling miniature lightning bolts frozen in the material. However, it’s crucial to handle such demonstrations with caution due to the potential hazards associated with high-voltage electricity.

Chapel Prank

Practical Jokes 2024

Blanchard Hall 1858

Edman Memorial Chapel

Capital Improvement Plan | 2022-2026

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Illinois

Hash Bash

“Thou shouldst not have been old till thou hadst been wise.”
— William Shakespeare (King Lear, Act 1, Scene 4)

“King Lear and the Fool in the Storm” 1850 | William Dyce

Hash Bash 2024

Ann Arbor Festifools 2024

Practical Jokes 2024

 

“G.K. Chesterton’s Fence” is a concept often cited in discussions about change, reform, and tradition — in software as well as in “campus traditions”.

It’s derived from a quote by the English writer, G.K. Chesterton, which goes: “In the matter of reforming things, as distinct from deforming them, there is one plain and simple principle; a principle which will probably be called a paradox. There exists in such a case a certain institution or law; let us say, for the sake of simplicity, a fence or gate erected across a road. The more modern type of reformer goes gaily up to it and says, ‘I don’t see the use of this; let us clear it away.’ To which the more intelligent type of reformer will do well to answer: ‘If you don’t see the use of it, I certainly won’t let you clear it away. Go away and think. Then, when you can come back and tell me that you do see the use of it, I may allow you to destroy it.'”

In essence, Chesterton is cautioning against the impulse to dismantle or alter established systems, institutions, or traditions without fully understanding why they were put in place in the first instance. The “fence” represents any existing structure, rule, or tradition, while the act of removing it symbolizes reform or change. Chesterton suggests that before advocating for the removal or alteration of something, one should first understand its purpose and history. This is because such structures often have reasons for their existence, which might not be immediately apparent to those seeking change.

The principle emphasizes the importance of respecting tradition and the wisdom of those who came before, as well as the necessity of informed decision-making when it comes to implementing reforms. It urges individuals to exercise caution and humility, recognizing that existing systems may have evolved to address specific needs or challenges, and that blindly discarding them could lead to unforeseen consequences.

Language

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Lovely Day

Recorded January 2015

Mathieu Manach : Percussions

Jean-Michel Warluzelle : Bass & background vocal

Bruno Thivend : Guitar & background vocal

Pierric Tailler : Vocal & guitar

Bill Withers Official Site

Université de Lyon | Fête des Lumières 2019 – Les Rêveries Lumineuses de Léonard

Practical Jokes 2024

Math Professor Fixes Projector Screen

Binary Test Result

Quick Adjustment

Keeping MIT Weird

Fake Professor

History of Western Civilization Told Through the Acoustics of its Worship Spaces

 

Abstract.  Insights into the history and future of western civilization are found by applying information theory to the acoustical communication channel (ACC) of its worship spaces. Properties of the ACC have both influenced and reflected the choice of message coding (e.g., speech or music) at various times. Speech coding is efficient for acoustically dry ACCs, but hopeless for highly time-dispersive ACCs. Music coding is appropriate for time dispersive (reverberant) ACCs. The ACCs of synagogues, early Christian house churches, and many Protestant churches are relatively acoustically “dry” and thus well suited to spoken liturgies. The spoken liturgy, dominant in synagogues, was carried over to early Christian churches, but became unworkable in Constantinian cathedrals and was largely replaced with a musical liturgy. After a millennium, the cathedral acoustic was altered to suit the doctrinal needs of reformation churches with its renewed emphasis on the spoken word. Worship forms continue to change, and the changes are reflected in the properties of the ACC. The pulpits of electronic churches may be evolving into radio and television performance spaces and naves into worshipers’ living rooms.

CLICK IMAGE

Evensong “How Do You Keep the Music Playing?”

Sacred Spaces

National Youth Choir of Scotland “Love Divine”

Time & Frequency Services

The National Institute of Standards and Technology is responsible for maintaining and disseminating official time in the United States. While NIST does not have a direct role in implementing clock changes for daylight saving time, it does play an important role in ensuring that timekeeping systems across the country are accurate and consistent.

Prior to the implementation of daylight saving time, NIST issues public announcements reminding individuals and organizations to adjust their clocks accordingly. NIST also provides resources to help people synchronize their clocks, such as the time.gov website and the NIST radio station WWV.

In addition, NIST is responsible for developing and maintaining the atomic clocks that are used to define Coordinated Universal Time (UTC), the international standard for timekeeping. UTC is used as the basis for all civil time in the United States, and it is the reference time used by many systems, including the Global Positioning System (GPS) and the internet.

Overall, while NIST does not have a direct role in implementing clock changes for daylight saving time, it plays an important role in ensuring that timekeeping systems across the country are accurate and consistent, which is essential for the smooth implementation of any changes to the system.

CLICK IMAGE to access complete document

More

Time Realization and Distribution

Horologiorum

Hosanna to the Son of David

Matthew 21:1-11 recounts the events of Palm Sunday, the triumphal entry of Jesus into Jerusalem:

1 As they approached Jerusalem and came to Bethphage on the Mount of Olives, Jesus sent two disciples, 2 saying to them, “Go to the village ahead of you, and at once you will find a donkey tied there, with her colt by her. Untie them and bring them to me. 3 If anyone says anything to you, say that the Lord needs them, and he will send them right away.”

4 This took place to fulfill what was spoken through the prophet: 5 “Say to Daughter Zion, ‘See, your king comes to you, gentle and riding on a donkey, and on a colt, the foal of a donkey.'”

6 The disciples went and did as Jesus had instructed them. 7 They brought the donkey and the colt and placed their cloaks on them for Jesus to sit on. 8 A very large crowd spread their cloaks on the road, while others cut branches from the trees and spread them on the road. 9 The crowds that went ahead of him and those that followed shouted, “Hosanna to the Son of David!” “Blessed is he who comes in the name of the Lord!” “Hosanna in the highest heaven!”

10 When Jesus entered Jerusalem, the whole city was stirred and asked, “Who is this?”

11 The crowds answered, “This is Jesus, the prophet from Nazareth in Galilee.”

The term “Hosanna” originates from Hebrew and is often translated as “Save, we pray” or “Save us, we pray.” It is an expression of adoration, praise, and supplication.  It’s origins lie in the events of Palm Sunday, which commemorates Jesus Christ’s triumphant entry into Jerusalem. According to the Gospels, Jesus rode into Jerusalem on a donkey while crowds of people laid palm branches and their cloaks on the road, shouting “Hosanna to the Son of David! Blessed is he who comes in the name of the Lord! Hosanna in the highest heaven!”

 

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