Top 100 presentations

1. Continuous Verb Tenses
   35209
2. Support and transport in plants
   33703
3. Anyong Tubig Anyong Lupa sa Asya
   29235
4. Elements compounds and mixtures
   25907
5. Chromosome
   21860
6. Simple Verb Tenses
   20747
7. Balancing Chemical Equations. Balancing redox equations
   20039
8. Atomic Structure
   20022
9. Periodic Behavior
   19835
10. Newton’s laws of motion
    18761
11. Periodic Trends
    16703
12. Adverbs
    16615
13. Percent Composition, Empirical and Molecular Formulas
    15939
14. Animal Farm
    15712
15. Bonding, Molecular Shape & Structure
    14663
16. MakingFood
    13333
17. Circulation and Gas Exchange
    13324
18. DNA - An overview
    12959
19. Fungi
    12814
20. Atomic Structure and Periodic Trends
    12754
21. Volumetric
    12606
22. Feminism- Cure or Curse
    12515
23. Atomic Structure and Periodicity
    12423
24. Hormones and the Endocrine System
    12041
25. Animal Development
    11920
26. Derivation Applications of Bernoulli Principal
    11825
27. Osmoregulation and Excretion
    11356
28. Plasma Membrane-Gateway to the Cell
    10723
29. Plant Structure, Growth, and Development
    10604
30. Acid, bases and salts
    10157
31. Development
    10136
32. Mirrors and Lenses
    10056
33. Structure of the Atom
    9891
34. Balanced forces
    9852
35. Ancient Civilizations
    9764
36. Mass Spectrometry
    9718
37. Pronouns
    9708
38. Nouns
    9639
39. Resource Acquisition and Transport in Vascular Plants
    9393
40. Forests
    9338
41. Support and transport in plants
    9281
42. Atomic Structure
    9257
43. Cell Types and Cell Structure
    8960
44. Newton’s third law of motion
    8873
45. Animal Nutrition
    8619
46. Transplantation Immunology
    8549
47. Cellular respiration
    8464
48. Growing Plants
    8294
49. Sensory and Motor Mechanisms
    8247
50. Electrical Circuits
    8202
51. Plant Responses to Internal and External Signals
    8024
52. Lab Equipment
    7981
53. Prepositions
    7945
54. Viruses, Viroids, and Prions
    7840
55. Neurons, Synapses, and Signaling
    7803
56. Of Mice and Men
    7753
57. Basic Structure of a Cell
    7609
58. A Tour of the Cell
    7602
59. Real time PCR and it's functions in diagnosis
    7552
60. Covalent Bonding (Molecules)
    7545
61. Plant structure adaptations and responses
    7518
62. Ionic Bonding
    7420
63. Cellular Division
    7372
64. Mendelian Genetics
    7016
65. To Kill a Mockingbird
    7015
66. Blood Type Genetics
    6972
67. Satellite Orbits and Uses NIS
    6954
68. Molecules and Ions
    6882
69. Well logging The Bore Hole
    6855
70. The Immune System
    6761
71. Sound
    6756
72. Membrane Structure and Function
    6655
73. Animal Reproduction
    6639
74. The Chemistry of Acids and Bases
    6591
75. Rocks
    6573
76. Angiosperm Reproduction and Biotechnology
    6569
77. Plant Diversity
    6521
78. Mendel and the Gene Idea
    6457
79. Balancing Chemical Equations
    6443
80. Cell Communication
    6439
81. Rate Laws
    6325
82. Drama
    6292
83. Hybridization of Orbitals
    6269
84. Introduction to Oscillations and Simple Harmonic Motion
    6251
85. The Building Blocks of Matter Atoms
    6199
86. Empirical Formula
    6185
87. Electron Quantum Numbers
    6125
88. Translation. Protein from RNA
    6068
89. An Introduction to Metabolism
    6058
90. Neurons
    5996
91. The Structure and Function of Large Biological Molecules
    5885
92. The Mole
    5880
93. Cell Membrane + Tissues & Organs Definitions
    5835
94. Photosynthesis
    5814
95. Karyotypes
    5809
96. Earthquakes
    5801
97. ADP, ATP and Cellular Respiration
    5776
98. Endocrine System
    5738
99. Classical greek philosophy
    5624
100. Conjunction
     5594

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)